My setup is pacesetter long tubes, pacesetter off road y pipe to an slp catback lmII. When I am sitting in idle and when I am in reverse my y pipe sits against the bracket that holds it up and it is meant for the stock exhaust and I am not sure how to stop the rattling because I don't want to take the bracket completely off since it provides support. Any ideas?

 

The only thing holding my system in place is the motor and hangers just before the bumper. Not really sure how your ypipe is held in there. Is it a c clamp and a hanger, or a piece welded to the Y that slips in a rubber bracket? Something else?

 

i had the same y-pipe/header rattle. it was actually hitting against the bottom of the car. i replaced the motor/trans mounts, and it solved the problem.