Ecoboost Performance Forum

I've been kicking around exhaust ideas for a while. After reading some of my questions, Spartn27 contacted me and explained he is starting up an aftermarket components company to build and market some of his ideas that he would like to see in the aftermarket world. He pitched me an idea for a prototype he had in mind...using similar technology to the Nissan GT-R exhaust. So before I go any further I have to extend a HUGE thank you to Spartn27 for reaching out to me with his ideas, and including me on his build.

We hashed out the details for a couple weeks and the research was ridiculous. After everything checked out, and the parts arrived, it was time to find a shop that would / could give us what we wanted. I landed on G&M Express in Holland, MI. Kind of a hole in the wall shop to be perfectly honest; but they had all the answers I was looking for. 30+ years of combined pipe bending between the two installers (one of which was the owner, Glenn). They subscribed to the mantra: "bending pipe is art...and you can either draw good, or you can't"...also Glenn calls everyone "Papa". LOL

I made an appt. for this afternoon, and we got right to work. They were cool with me being very active in the bay with them to get everything just how I wanted it.

**DISCLAIMER**
Beyond discussing the details of this build with Spartn27, I have NO affiliation with MDesigns or G&M Express.

First step was cutting out the stock exhaust, right up to the downpipe flange. So, let's talk about what it is we're replacing:
On the left end you can see the flex pipe on the downpipes going into the flange. From there, dual 2.25" pipes enter and exit the third cat, and go straight into the resonator.
(https://lh3.googleusercontent.com/-EKl9Z-5COrE/U2aEeERPJwI/AAAAAAAAEE0/bQNnjPM6lM8/w925-h615-no/DSC_0232.JPG)

This is what the 3rd cat (left) and res (right) look like off the car:
(https://lh5.googleusercontent.com/LhEmiwJoJatK-NJz9orssKPDyG3aKBKJeaTdA1KdzKU=w925-h615-no)

Looking down into the inlet of the third cat. You can see the steel honeycomb (looks like a fine mesh) that runs the length of the cat (about 10").
(https://lh4.googleusercontent.com/-deJc-r361mc/U2rgiaG_HPI/AAAAAAAAEbs/NYsxKexv3b4/w925-h615-no/DSC_0002.JPG)

Looking down through the outlet of the resonator...Much to my surprise, this looks like it's just a straight piece of solid 2.25" pipe (x2) that runs the length of the resonator. My guess is it decreases resonation through the sound-deadening properties of sheer mass alone (res body about 20" long).
(https://lh4.googleusercontent.com/-cUfLlO4ECSA/U2rhZEOqMvI/AAAAAAAAEeE/90mxnUX14HI/w820-h615-no/IMG_1353.JPG)

The dual 2.25" pipes leave the resonator and travel back to double 90* bends
(https://lh6.googleusercontent.com/-r1edf41TUxE/U2aD7guY2tI/AAAAAAAAEDQ/t9Xy8pMZnBU/w925-h615-no/DSC_0221.JPG)

(https://lh6.googleusercontent.com/-OyL-iRNLuzo/U2qz4LgK-vI/AAAAAAAAEQo/3QrZOm6orOk/w925-h615-no/DSC_0030.JPG)

Then snake up to stock mufflers and 4" Chrome tips
(https://lh4.googleusercontent.com/-0FwjkiFpzmc/U2aED9blMpI/AAAAAAAAEDs/EjpjmLbf-So/w925-h615-no/DSC_0223.JPG)

(https://lh6.googleusercontent.com/-kVnvjr7uJgM/U2q0DvHM6-I/AAAAAAAAERM/T6PWH7arirI/w925-h615-no/DSC_0035.JPG)

Looking backwards through the OEM muffler outlet you can see it's straight pipe back to the front of the muffler, where there's a flat wall, and an opening. This tells us the OEM mufflers area  chambered muffler...which I'm pretty sure is BAD for turbo's since it can create a shockwave that travels back to the turbo. Maybe less of an impact being that it's at the end of the road.
(https://lh3.googleusercontent.com/-8xInAFAkAms/U2rha3j60qI/AAAAAAAAElg/yF1vUBRfJx0/w820-h615-no/IMG_1354.JPG)

Now...on to what we put in it's place. Let's start with the front.

I had him leave the stock downpipe flanges in place for easy connections once I spring for EPP DPs.
(https://lh4.googleusercontent.com/-kxmnxXNN13w/U2rg3UtRcRI/AAAAAAAAEcA/ET1WA9fDjz0/w820-h615-no/IMG_1334.JPG)

First step was opening up about a 3" long piece of stock 2.25" pipe on the rear side of the OEM flange, to 2.5" ...x2. Then welded on 2x 2.5"-bends to widen the birth from the stock flanges, outwards.
(https://lh4.googleusercontent.com/-YBmNcVrnmfg/U2qy4LKsTyI/AAAAAAAAEOU/yhVQBend1DQ/w925-h615-no/DSC_0011.JPG)

The wider birth was needed to make the connections from the flange to the new resonator. The body is a 4"x9" oval, and is only 11" long.
(https://lh5.googleusercontent.com/-snwEtBAfiyM/U2qy45Ku6vI/AAAAAAAAEOc/XLJveh63PaM/w925-h615-no/DSC_0012.JPG)

Magnaflow Dual 2.5" straight through, in/out. NO-X.
(https://lh3.googleusercontent.com/-PwOasVtf90g/U2qykwPwFiI/AAAAAAAAENg/VrWexz1uWqg/w925-h615-no/DSC_0004.JPG)

Two more 2.5" bends coming out of the resonator, to reduce the birth narrower for the Y-Pipe...Yeah you heard me...Y-Pipe!
(https://lh5.googleusercontent.com/-MJgxsWjQbeo/U2qzAORljNI/AAAAAAAAEOk/HZBdxM6ePSM/w925-h615-no/DSC_0013.JPG)

Magnaflow dual 2.5" into single 3" Y-Pipe. The purpose of reducing down to a single larger diameter pipe is to reduce surface area. Two 2.5" pipes have far greater surface area than a single 3". When you're talking laminar flow, surface area is bad. Not only does it create skim loss wherever the gasses drag across the surface, but also acts as a heat sink to cool the gasses, which makes them more dense, and again slows them down. By using a single large diameter pipe we're able to keep velocity up, friction down, and maximize the inside area of the pipe for better flow.
(https://lh4.googleusercontent.com/-Spyrl6Imaz0/U2qzDGHgXqI/AAAAAAAAEO0/snAgJDZARho/w925-h615-no/DSC_0015.JPG)

Not to mention all of the benefits of an X-Pipe; harmonizing exhaust gasses, etc.
Simple math would appear to give you more inside area with 2x 2.5" pipes than a single 3"...which is true...but with the added friction loss from smaller pipes, inside area is no longer the winning attribute in hyperphysics.
(https://lh6.googleusercontent.com/-j2VhpkVuvKA/U2qzTarlwuI/AAAAAAAAEPU/1drSeOpMS6g/w925-h615-no/DSC_0019.JPG)

The single 3" pipe then travels back to where the original 2.25 pipes hit their 90's and enter another Y. This time it's backwards - Single 3" to dual 2.5"
(https://lh5.googleusercontent.com/-VaS68Z_3Krw/U2qzi1AGfNI/AAAAAAAAEP0/A4gyUjhwcs8/w925-h615-no/DSC_0024.JPG)

Setup so far
(https://lh3.googleusercontent.com/-Fpz4_GPcI64/U2qzt5V9blI/AAAAAAAAEQU/kz7HSMgc45c/w409-h615-no/DSC_0028.JPG)

From here, each 2.5" outlet is met with a single 2.5" dual 90* pipe, on an upward angle to each muffler.
(https://lh5.googleusercontent.com/-Scxt-fwLrYw/U2q0M1AizrI/AAAAAAAAERU/Lo84TVzxZ6s/w925-h615-no/DSC_0036.JPG)

...as such
(https://lh5.googleusercontent.com/-omyM_oQr930/U2q3JMaBaFI/AAAAAAAAEYs/dPyh1rqHMRE/w925-h615-no/DSC_0092.JPG)

Magnaflow mufflers are a similar straight through design to the resonator. Only difference being they have a slight bend in the center from offset in, center out. Same dimensions as the resonator; 4x9" Oval 11" long.
(https://lh3.googleusercontent.com/-HUjM9ZcbRIs/U2q0UYom1fI/AAAAAAAAERs/Al0IfHlmZyw/w925-h615-no/DSC_0039.JPG)

A small piece of 2.5" was welded in, to bridge to the tip
(https://lh4.googleusercontent.com/-x9xXUcDbThA/U2q0NgreyPI/AAAAAAAAERk/E8RTl8GUdHE/w925-h615-no/DSC_0037.JPG)

And the tips were welded in place.
(https://lh6.googleusercontent.com/DZIvQvcaQGmEpBXtlQF1SpMroj7-Mk18DmWkBRzeuIM=w643-h615-no)

2.5 to 4" Double wall stainless tips. These were originally chrome, but were professionally stripped and powder coated satin-black.
(https://lh3.googleusercontent.com/-qmGhWUPmfjw/U2q2_84o3cI/AAAAAAAAEYU/vLd3HcbxIgM/w925-h615-no/DSC_0090.JPG)

Ditto for the other side
(https://lh6.googleusercontent.com/-osjSXt4ogaE/U2q3IIr6DCI/AAAAAAAAEYc/QDDNX48RBp4/w925-h615-no/DSC_0091.JPG)

It doesn't look like it because of the bend and the angle taking the pic from, but the center section of 3" is about 4.5' long.
(https://lh3.googleusercontent.com/-_ppkkOrREW4/U2q3Tkj5NkI/AAAAAAAAEY8/-EUEvA78JBA/w925-h615-no/DSC_0095.JPG)

Finishing touches and adding the final hangers to line up with OEM
(https://lh3.googleusercontent.com/-JY_BnKzLGG8/U2q3qNMrQfI/AAAAAAAAEZ8/d1gPwod5bQU/w925-h615-no/DSC_0103.JPG)

Shot from front to back
(https://lh6.googleusercontent.com/-IYkXy9z2apg/U2q3ykadqbI/AAAAAAAAEaQ/CgInN1g4nXM/w409-h615-no/DSC_0105.JPG)

After everything was welded in place, the entire system was coated in matte-black ceramic exhaust paint (mufflers, tips, and resonator excluded).
(https://lh3.googleusercontent.com/EbFaCRz4B3BAtK5HOa0KMMzfWp0_lR0A4XZqmZQFG_A=w820-h615-no)

The result was unlike anything else currently offered for our platform. Rather than trying to make it sound like a big V8 (which is isn't), it makes it sound like what it is; a twin turbo charged, high performance, work of art.

There is ZERO buzz or rasp.
The exhaust note is VERY deep. It sounds like a 12" subwoofer just humming away.

From inside the cabin you can hear a quiet low tone that almost disappears with throttle. Cruising speed, the sound is noticeable, but not obnoxious and has no drone.

To be honest I was actually a little disappointed initially because it sounded so quiet, but after getting out and walking around the truck I noticed is has a different personality from outside the vehicle.
There really isn't any 'bubble' or 'camming' sound, it's very smooth and consistent (courtesy of our giant x-pipe (aka the 3")), the note is so smooth and deep you can feel it in your chest.
Volume is on the lower side, and overall pretty quiet with throttle.
When you let off the throttle from a rev it has a slight 'falling over itself' tone.

I'm terribly curious to hear the change once I start messing with downpipes and or intake.
No turbo whistle is audible, just like before....yet.
Butt-dyno on the way home felt like it pulled harder, but that's so subjective you'll have to take it for what it's worth.

Due to the exotic sound of this setup, I'm having a hard time providing anything remotely close to accurate with a sound-clip or video. It's just so low I cant find a mic to pic it up, but I'll play with that tomorrow too.

More follow-up and adjustments to come...but I teased you all enough throughout the day, I knew I had to get something posted! ;D

I got a decent video today, and some enlightening tinkering results!

As for the results of the tinkering:
I was curious where the restriction was, now that the exhaust was free'd up and I still couldn't hear any turbo noise over stock.

With an open airbox and no filter...no turbo sound.
Open downpipe flange...still no audible turbo noise.
Then both open downpipes and open intake. Still no change in turbo noise.
This leads me to believe the main restriction of air flow in or out is the downpipes.
This coincides with the large HP gains seen with larger diameter DPs, compared to small gains from exhaust and intake. Suspicion validated!

You put allot work into this. THANK YOU! I really appreciate all the work you have put into this.

Just to say it again...

Nice job Jack... I know Spartn was anxious to see it on your ride.... Now we can officially talk about it... The math (MUCH better flow than any dual yet), etc.  And much cheaper than the leading catbacks!

It's available as a kit from him for shipping.... contact Spartn for details on this

Oh yea,... and much more to come soon!!

Quote from: Josephm on May 08, 2014, 01:07:01 AM
You put allot work into this. THANK YOU! I really appreciate all the work you have put into this.

Thanks guys. That's why we're all here, right? To expand this site as a resource for each other.

I didn't know what would happen with this exhaust...and no one else has done it, so no one else knew what would happen...now we ALL know what happens! lol

It's a labor of love...just like the ride itself.

Quote from: BiGMaC on May 08, 2014, 01:11:15 AM
Just to say it again...

Nice job Jack... I know Spartn was anxious to see it on your ride.... Now we can officially talk about it... The math (MUCH better flow than any dual yet), etc.  And much cheaper than the leading catbacks!

It's available as a kit from him for shipping.... contact Spartn for details on this

Oh yea,... and much more to come soon!!

Looks nice ... any plans for dyno ?

Mathematically higher flow .... but only dyno will provide positive proof .

Before stock dyno whould be nice too.

I agree that the numbers don't lie...all the math in the world counts for naught if the production isn't there in the outcome.

As for dyno plans...not much as of yet. We'll see who turns up in my area as a resource.

I'm probably much more likely to put it on a track before I put it on a treadmill.
THOSE are the real numbers IMHO. lol

That is looking really good. I wanna hear that in person. What does Spartan think about cutout use.  Instal one cutout in the 3 inch pipe or 2 smaller cutouts.

Quote from: panther427 on May 08, 2014, 02:08:13 AM
That is looking really good. I wanna hear that in person. What does Spartan think about cutout use.  Instal one cutout in the 3 inch pipe or 2 smaller cutouts.

Oooooooh...I like that single 3" idea.
uh-oh wallet...

I'm sure he'll be around here tomorrow, I'm excited for his response.
I would assume nothing but good things since it's just decreasing back pressure on WOT, post boost curve engagement.

I want to do an electric cutout. So one 3 inch would be cheaper. (

Very cool.
Can't wait to hear a sound clip...

To achieve a great product at a great price is commendable :thumb:  I forget where I read it earlier, but I think there is also some innovative work going on with Mercedes Benz and Audi exhaust systems.

I assume the paint will take care of any heat issues with the new pipes?  What were the temps on a warmed up stock exhaust vs now?  Same question with the unpainted mufflers.  May need to heat shield them in some manner.  Loss of surface area also means less heat transfer unless superior materials or superior designs are used.

Look forward to your track/dyno testing, and some sound/video clips :)

Excited that you guys finally put this plan to action and hopefully it shows gains at a good price. Any idea what this set-up will cost?
I just have to wonder if the gains provided by the reduction in skim loss in the 3" section is negated by the extra bends in the 2.5" pipe and the restriction created by the y-pipes.

I'll let Spartn27 field any $$ q's, I'm just the guy that made a prototype. Lol

As for increased flow v. restrictions, your guess is as good as mine, but after all of the research, I basically came up with; "well, if it's good enough for a GT-R...it's good enough for my XSport." I realize they're different vehicles, but on paper the engines are actually pretty close to start (numbers anyway).

Just a thought here, but what if you replaced the dual 2.5" mid-muffler with a single 3" mid-muffler like the following:
http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=11517 (http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=11517)
This would allow you to put the Y-pipe right after the downpipe and maximize the length of 3" straight tubing.

Or just use this in place of the first Y-pipe:
http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=11577 (http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=11577)

What you described reminds of the exhaust on my Audi s 4 with the inline 5 cylinder Turbo motor running an ABT exhaust. Really deep tone.

Managed to get a decent video. I'll have a clip up this afternoon!!

Quote from: SwampRat on May 08, 2014, 01:17:05 AM
Looks nice ... any plans for dyno ?

Mathematically higher flow .... but only dyno will provide positive proof .

Before stock dyno whould be nice too.

Quote from: JimiJak on May 08, 2014, 01:20:42 AM
As for dyno plans...not much as of yet. We'll see who turns up in my area as a resource.

I'm probably much more likely to put it on a track before I put it on a treadmill.
THOSE are the real numbers IMHO. lol

^^I will basically be doing the same as JimiJak above, though as he also mentions I will most likely hit the track before the dyno. Within the next couple weeks I will stop by LMS and see what I can do also.

Quote from: panther427 on May 08, 2014, 03:13:15 AM
I want to do an electric cutout. So one 3 inch would be cheaper. (

You could definitely throw an electric cut out at the single 3" section, therefore only needing 1 3" cutout. With downpipes you should see great gains out of the combination.

Quote from: SRT82ECOBOOST on May 08, 2014, 08:05:23 AM
Or just use this in place of the first Y-pipe:
http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=11577 (http://www.magnaflow.com/02product/shopexd.asp?zone=main&id=11577)

This was pondered though it would be more effective to eliminate rasp by having the resonator serve just as a resonator and not both a resonator and y-pipe. The main thing with this exhaust was to increase flow while not creating any rasp other kits may offer.

As far as price, there are no concrete numbers as of yet though $850~ seems to be where it is at as of now.

Just another thought Aero turbine muffler offer straight shot resonators in a bullet design. P think there cost is higher but I don't know cost vs performance and simpler install y pipe right into the 3 inch pipe.

850.00 ish   is definitely a bunch cheaper !

Sorry if I missed it, when is the exhaust expected to be available for 'mass production'?

As for the official production verdict, I'll leave that for Spartn27.

I've heard there are talks of two options to choose from, in the works. So I'm not sure if that's getting ironed out before the "official release", or what.

*videos moved to first post in thread.

I like it.

Nice job Jack!... good info too... I like the new exhaust note!  :thumb:

I've been thinking more about exhaust lately due to the cutout thing. I have been impressed with one new idea by Spartn.... here's my thinking which Jack, Spartn, and I have discussed together.... I believe the ideas are sound (no pun intended, LOL)...

The catbacks available for SHO/MKS/transverse 3.5 EB.... (Except for the new one that Spartn has just gotten completed and Jack has installed) make what I think is at least potentially an error by staying dual and OEM size. I am a fan of dual exhausts, but you can't ignore the math in trying to increase flow after you deal with cats/mufflers/resonators/etc ..which are obvious. see below. Also note the GTR uses a similar design to improve exhaust note without raspiness or drone. I think we often make the mistake of trying to make our V6 sound like a V8... instead of a high performance V6 engine.

The numbers for cross-sectional are usually not thought of with an allowance for pipe wall thickness. All pipe is sold based on it's outside diameter, which is irrelevent to it's flow characteristics. To obtain the correct cross-sectional area of the inside of the pipe, you need to subtract the pipe thickness first. So check it out... using a single 3" pipe is actually bigger in cross section.

Some comparisons of pipe cross sectional area:
OD/ID(")...............Inside Area(sq. in.)
2.5/2.375....................4.430
3.0/2.875....................6.492
3.5/3.375....................8.946

So in fact, a single 3.5" pipe has a larger inside cross sectional area than two 2.5" pipes.

Something else to consider is the inside surface area, as measured along the inside walls, especially for the cooling effects on gas flow. The more wall area, the larger to friction with air trying to move through... This is even more dramatic, especially when the contraction of gas (due to cooling) slows it's movement simply because it looses volume.

Another comparison:
OD/ID...................Inside Surface
2.5/2.375..................7.461
3.0/2.875..................9.032
3.5/3.375.................10.601

As you can see, two 2.5" pipes would have approximately 40% more inside surface area than a single 3.5" pipe. The frictional losses from this extra area would likely be minimal, because the gases along the wall flow very slowly(relative to the gases nearer the center).... but they do move slower due to friction resulting in an increased back-pressure. More important, IMHO, is the cooling effect caused by gases in contact with the wall inside surface area. As these gases cool, they draw heat away from gases nearer to the center. As gas loses heat it loses volume and therefor velocity, the added inside surface of the dual pipes should cool the exhaust more than the single pipe and cause a corresponding loss in velocity of flow of engine exhaust... Cooler weather (which we want for our turb'd engine performance) should actually amplify this effect.

The sound part is proven I think (Thanks Jack!)... dyno's/track times on the MKS/SHO/XSport are still on the way

Just my 2 cents... but I think it's thought provoking when the math is done.

I like this set up. I want to hear the corsa in person.   But this has sound but still mellow.

As Jack described there might be minor tweaks to the design and then I will have all details finalized, I am looking into changes to get more sound out of the catback without introducing rasp.

If everything goes according to plan I will be doing a baseline dyno with only mods being an intake system and then a pull with the exhaust and intake to get some real numbers out there.

I may go get this done but with a y right after the down pipe.  Then the question would be cut out before or after the resonator.

Any thoughts of using the venturi effect in an exhaust system

Next tinker may involve closer to what you're describing Panther. For me, if I'm doing a cut out...I'm going all the way...so right up to the downpipes, before the resonator.

Quote from: panther427 on May 09, 2014, 01:12:34 PM
I may go get this done but with a y right after the down pipe.  Then the question would be cut out before or after the resonator.

Any thoughts of using the venturi effect in an exhaust system

I plan to hopefully offer the same exhaust kit though with a built in boost activated cut out. Personally I would like the exhaust cutout to be placed after the resonator which shouldn't hurt performance due to the free-flowing straight through design of the resonator. It should help reduce just a tad bit of rasp, somewhat of a resonated exhaust cut out.

Well it's all talk at the moment.  I can't decide what I want to spend my money on lol.   But seriously good job on thinking outside the box with this.  Really like the current sound.  Deep and mellow. Reminds me and bit of GM 3.8 exhaust note.  But I'm hoping for some Turbo whistle. That's the noise I want to hear.

You won't get that without downpipes.
Open intake, open downpipes (ZERO exhaust)...still no turbo whistle.

After the DPs are upgraded, you need an exhaust that's restriction free to keep that whistle.

You'll be happy to hear MDesigns is very open to all of our ideas.

From what I've heard from Spartn he is taking all of your comments under advisement and giving us all what we want. A sleeker, simpler design with a little more volume and a built in cut-out option. The system I have is perfect for the daily driver, or "sleeper" build that's looking to keep DBs down with no rasp and no drone.

It looks like this wasn't the final prototype after all.

@Spartn27, we look forward to the updates and improved design.

It's nice to see homegrown businesses come to fruition, and I wish MDesigns the very best of luck in their launch and further endeavors.

Quote from: JimiJak on May 09, 2014, 06:16:02 PM
You'll be happy to hear MDesigns is very open to all of our ideas.

From what I've heard from Spartn he is taking all of your comments under advisement and giving us all what we want. A sleeker, simpler design with a little more volume and a built in cut-out option. The system I have is perfect for the daily driver, or "sleeper" build that's looking to keep DBs down with no rasp and no drone.

It looks like this wasn't the final prototype after all.

@Spartn27, we look forward to the updates and improved design.

Thanks for all the help Jack!

Quote from: SHOdded on May 09, 2014, 06:21:00 PM
It's nice to see homegrown businesses come to fruition, and I wish MDesigns the very best of luck in their launch and further endeavors.

Thank you! Just trying to give the consumers what they need at a good price, as I know how it feels to be a consumer myself!

Quote from: JimiJak on May 09, 2014, 06:16:02 PM
You'll be happy to hear MDesigns is very open to all of our ideas.

From what I've heard from Spartn he is taking all of your comments under advisement and giving us all what we want. A sleeker, simpler design with a little more volume and a built in cut-out option. The system I have is perfect for the daily driver, or "sleeper" build that's looking to keep DBs down with no rasp and no drone.

It looks like this wasn't the final prototype after all.

@Spartn27, we look forward to the updates and improved design.

I would be moreinterested as is. I do not like a lot of noise. Especially the drone sound of a V6 trynna sound like a V8. What you have is great. So if he does continue to make changes, please have an option to keep the "silent sleeper" alive and well. Dont wanna be heard or seen. Just tail lights. (get it) lol.

Quote from: Dxlnt1 on May 11, 2014, 12:00:47 AM

Quote from: JimiJak on May 09, 2014, 06:16:02 PM
You'll be happy to hear MDesigns is very open to all of our ideas.

From what I've heard from Spartn he is taking all of your comments under advisement and giving us all what we want. A sleeker, simpler design with a little more volume and a built in cut-out option. The system I have is perfect for the daily driver, or "sleeper" build that's looking to keep DBs down with no rasp and no drone.

It looks like this wasn't the final prototype after all.

@Spartn27, we look forward to the updates and improved design.

I would be moreinterested as is. I do not like a lot of noise. Especially the drone sound of a V6 trynna sound like a V8. What you have is great. So if he does continue to make changes, please have an option to keep the "silent sleeper" alive and well. Dont wanna be heard or seen. Just tail lights. (get it) lol.

Depending on how the new design sounds I'll know if it will be necessary to have both options, Im planning on it opening the exhaust just a tad more without adding rasp. I am all for the silent sleeper look as I do own a MKS which people tend to think is an "old mans car", therefore precautions are being taken as with the prior design to keep drone/rasp to a bare minimum, if any at all.

As far as "old man car" little do they know what's under the hood!

My thoughts aren't after trying to majdtgt louder. Only thoughts on making it possibly cheaper and easier to make and install. Though in curious to the sound change with the resonator in the 3 inch section. If any

You should dyno each exhaust you do make. See if there is a change in power between design. 

Quote from: panther427 on May 11, 2014, 12:21:54 AM
My thoughts aren't after trying to majdtgt louder. Only thoughts on making it possibly cheaper and easier to make and install. Though in curious to the sound change with the resonator in the 3 inch section. If any

You should dyno each exhaust you do make. See if there is a change in power between design.

Those revisions are currently being looked at and parts ordered for them, also contacted LMS to figure out dyno costs and will be heading down after I get some maintenance done on the car. Would like to have the PTU BG serviced and flushed along with my brake kit installed before jumping on the dyno or doing any track testing.

Now it's just a waiting game with the UPS man!

I understand it's always about time and money..  I know I really like what you have come up with and wanna help.

Thanks for your hard work

Outstanding work gentlemen!

:clap2:

I haven't been fond of the sound or price of any of the current offerings.

It's about time somebody designed a system to enhance the tt V-6 sound, I don't want my force fed Big Girl to sound like a V-8. If I wanted the characteristics of a V-8 I'd be driving a Mustang.

I look forward to some drive by vids at full tilt.

:thankyou:

Good idea!
I'll see what I can do.

I would like to get a setup like bigmoneycloser used for his corsa filming...that way we could really hear what's going on back there while I'm going down the road! lol

Hoping to hear more clips as I am sending the car to the custom exhaust shop this week.

Anything new to report back on regarding this exhaust? I was curious about resolving the drone at low rpms....

I saw Spartn27 posted this in another thread 'Carbon Fiber' and thought I would put his quote here:  "It wasn't cost effective to manufacture and have them all handmade at the quality I would like to put my name on. Also after testing many setups I highly recommend just modifying the OEM cat + resonator by deleting them and replacing them with a free flowing aftermarket resonator. The stock mufflers do a great job at killing drone."

If your like me, I sometimes read a thread and can never find it again.  Hope this helps you future modders.....

Quote from: pejohnson on September 23, 2014, 02:20:27 PM
I saw Spartn27 posted this in another thread 'Carbon Fiber' and thought I would put his quote here:  "It wasn't cost effective to manufacture and have them all handmade at the quality I would like to put my name on. Also after testing many setups I highly recommend just modifying the OEM cat + resonator by deleting them and replacing them with a free flowing aftermarket resonator. The stock mufflers do a great job at killing drone."

If your like me, I sometimes read a thread and can never find it again.  Hope this helps you future modders.....

Thank you! As mentioned above, plans for the exhaust do not seem feasible and I will actually be letting go of my last prototype design. If anyone is interested, it is a bolt on system and uses the OEM catback flanges, high flow resonator, 2 Magnaflow Y-pipes, and 2 Aero mufflers. Not including labor/exhaust shop costs and just parts this cost me $400, will give someone a good deal on it if picked up. PM if interested, mods can close this thread if need be.

What ever happened to the dual intake designs?