I have bassani mid pipes and just put FloMaster 40 Series on. The exhaust rattles extremely bad, but it did not do it with stock mufflers. I have tried 2 different types of mufflers and the problem is still there. Any suggestions?

 

did you remember to align the exhaust?? its probably making contact in a few places.

 

it is welded front to back right? make sure they didnt take a cheap route and use clamps....