I believe the weld(s) holding my primary tube(s) in my collecters (FLP headers) are cracked. The headers on one side vibrate like crazy it is loud and annoying. As any one put some flex couplers after the collecter to help lesson this. this is for the car in my sig. Thanks Art

 

I don't use flex couplers, but I do use flux capacitors. If the weld connecting the primaries to the collectors is cracked, you need to get that welded back. A flex coupler may help after the collectors to help prevent vibration to the whole exhaust.

 

It will help, but I would make sure all your hangers are on and the exhaust isnt too tight causing the issue. Bad motor mounts can cause problems like this, but generally I see it from either from corrosion, bad hangers, installation error (exhaust is REALLY tight), or worse case, just bad materials.