Second Owner: Confused Exhaust Question
Thread Starter
Teching In
Joined: Oct 2011
Posts: 45
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From: Indianapolis
Second Owner: Confused Exhaust Question So I just bought this 06 GXP and it is pretty loud and very loud on the inside. I looked under the car and it appears to have the cat, resonator, and stock mufflers because they have a GM part number on them.
What could the owner have done to make it this loud? Also, did GM make a performance exhaust for these cars?
Thanks!
What could the owner have done to make it this loud? Also, did GM make a performance exhaust for these cars?
Thanks!
Well, if it appears to be stock and you can tell there's a res, cat and mufflers under there then I would check for a leak somewhere. GM didn't make a performance exhaust for the LS4 so the stock sound should be pretty "quiet" even under load.
Hmm you checked everywhere for a leak? Even where the downpipe bolts to the rear exhaust manifold? I was going to ask about headers too but someone covered that. If it was aftermarket I would think there'd be some kind of label or indication of what company it is on the mufflers/resonator.
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Teching In
Joined: Oct 2011
Posts: 45
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From: Indianapolis
Haven't checked the top of the mufflers for rot thru but will. I am trying to have the dealer find out from the previous owner what was done. It says GM on the mufflers. Here is a video that I just took, its not the best but you should be able to hear it well enough.
http://youtu.be/66Ruma5974g
http://youtu.be/66Ruma5974g
Launching!
Joined: Mar 2010
Posts: 237
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From: Buffalo, NY
the second rev at about 21-24 seconds kind of sounds like something has rotted out...Not sureo n the GXP, but i can crawl under my monte and see the top of the mufflers just fine, i would try that.
If it's not the mufflers, maybe the resonator. Mine rusted out after 3 winters on my 01 Monte SS, the metal used on those isn't normally all that thick, could be that.
If it's not the mufflers, maybe the resonator. Mine rusted out after 3 winters on my 01 Monte SS, the metal used on those isn't normally all that thick, could be that.
Launching!
Joined: Apr 2011
Posts: 214
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cold start the car and have you and a friend block the exhaust with gloves and your hands, if u hear exhaust still u know you have a leak. Is the res still there? any part of the exhaust hacked up? should be flanges and bends....not clamps and mig welds....
Launching!
Joined: Jul 2009
Posts: 247
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From: green bay
my car sounds exactly the same as yours and my mufflers are rotted through thats funny it sounds exactly like my gxp
Haven't checked the top of the mufflers for rot thru but will. I am trying to have the dealer find out from the previous owner what was done. It says GM on the mufflers. Here is a video that I just took, its not the best but you should be able to hear it well enough.
http://youtu.be/66Ruma5974g
http://youtu.be/66Ruma5974g
Thread Starter
Teching In
Joined: Oct 2011
Posts: 45
Likes: 0
From: Indianapolis
Got new flowmaster exhaust installed today and the improvement is 100%. We shall see if the dealer will cover the cost. $225 for 2 new 40 series installed by welding. Looks like a good job and sounds GREAT
!
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