A month or so ago, I had PPE catted downpipes installed on my XSport, and I've been very happy with them.  The exhaust shop that installed them did not give me my stock downpipes, and I didn't think to ask.  This past Sunday, I installed the Livernois/Corsa Thunderstorm catback system, and the result was terrible.  Startup & idle had a nice rumble, but anything over 2000 rpm was loud and super raspy.  If you've ever seen the "Rasp from Hell" video on YouTube (SHO w/Stainless Works downpipes & Livernois catback), mine sounded similar.  It was like a crappy Civic with a fart can.

I called Livernois, and the guy I spoke with pointed the blame on the PPE downpipes, saying that was the source of the resonation.  Livernois claims that their catback is compatible with the stock downpipes (which I no longer have) & their own custom downpipes.

So what to do now?  I already ordered 2 Vibrant 1793 resonators ($72 each from Summit), that I had planned to have welded in, but now I'm skeptical that they will be effective in taming the rasp.  Last night, I removed the Livernois catback, and put my stock back on; fortunately I still had that.  Should I sell the Livernois catback, and leave the stock system?  Should I weld in the resonators, see if it helps?  Should I cough up another $800 for the Livernois downpipes, with the hopes that they will be better?  Opinions appreciated.

Hopefully someone in the Great Lakes area can help out with their spare stock downpipes for testing.  I would talk to Livernois and see if they will take the catback as a return.

Assuming of course, there are no exhaust leaks, as gaskets have proved to be a problem in the past.  Try realigning the system and retorquing the gaskets, if that helps at all.

I just put on Livernois catted downpipes & Corsa catback...couldn't be happier. Well worth the money IMO.


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Did you try contacting your local muffler shop to see if they still have your stock DP because they are certainly worth some $$$$ and IMHO they should of asked you if you wanted them back considering your Sport is new,personally IMO would order two new resonators which should help in the "Rasp Dept"and have the muffler shop Install them for free because of negligence in there part for not returning your DP considering the cost which is roughly over 800.00 smackers and unfortunately your loss is there gain and best of luck and keep us updated on all fronts.  Z     http://www.levittownfordoemparts.com/auto-parts/2015/ford/explorer/sport-trim/3-5l-v6-gas-engine/exhaust-system-cat/exhaust-components-scat

I stopped by the exhaust shop yesterday, and was told that their scrap guy had come on Monday.  Missed it by 3 days!

Maybe the scrap guy still has it?