types of catback exhaust systems

[Night Hawk]

Good point, I have the same situation with sound, although only my wife... even though she's gotten used to the jackrabbit starts that I love  .  There is the question of adequate back pressure for safe engine function and 4DR's method seems to address this using manifold pressure/boost related activation.
The best of both worlds might be an automatic that could be electrically activated/disabled for those "quiet cruising" situations. Put the switch in with the automatic parking switch to hide it away.

I am not sure if there really is any issue with removing backpressure from the exhaust system with the cutouts as this is not a an N/A application. You can find conflicting information on this subject and it has even been discussed here on this forum, but I am of the mind set that you want the least restrictive exhaust possible on a turbo engine to allow for faster spooling.
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  I recommend  the SPT boost activated over the electric exhaust cutouts..pricey but worth it.

[crash712us]

I like my corsa system as it requires no cutting or welding and Corsa's chamber muffle design. Now with that said and the addition to down pipes on my car, it is quite loud. No drone, but very nasty sounding when cold. At WOT it gets quieter, must have something to do with more back pressure.
Now with all that said the stainless works exhaust seems to be of good value, I think Borla discontinued there system, and magna flow I have read they use a stainless steal that rusts.

Which downpipes? Catted or non-catted?  Do you have a video by any chance so we can hear what your are talking about?  Thanks.


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Catted LMS down pipes. I took some video with phone, it doesn't capture the sound well, actually sounds very mild on video. Will have to take my word for it.