Quote Originally Posted by FordMan77 View Post
If it turns out that the resonator is shot like mine was then grab a glasspack and have it welded in. Below is the notes on what I did from research on here:

the glass pack i got was a thrush 24205, it cost 25 bucks. (mine was 32 inch, i cut the inlet tube off and put the flange on there to shorten it up to fit) the flange was $10. i got that at a muffler shop. (no one else carry's them) got a new gasket when i got the glass pack, for the stock cat back flange connection (8 bucks) and then bought 2 new bolts and nuts, cause the old ones always snap off.

You'll want the 2.25 inlet and outlet on the glass pack. if your cat back is the stock welded pipes, you need to cut the old res out, then have the glass pack welded in. you wont need the new flange if it gets welded in. good time to delete the U bend if your car has that. for glasspack inlet to downpipe.
Dynomax exhaust adapter 41806
Its way easier to drop the whole exhaust off the car and then work on it if your going at this yourself. its only held up there by the 2 bolts to the cat, and a bunch of rubber hangers.
if you go to a shop they got a lift to work on.

I think I have this issue too on an 06 GP base. It isn't terribly loud yet, but getting worse. Inspected the exhaust and didn't find any holes, but I felt some hot air before and after the resonator. It must be coming from under the shield on mine too. Most noticeable on acceleration in low gears. How did you attach the flange to the glasspack? This looks cheap and effective.