Banging exhaust
LS1 Y-Pipe "Bump Stop" Hanger
http://www.thunderracing.com/catalog...&vid=3&pcid=54
about 3/4 down the page.
Then look at the y after it's merged. The was an area were it started hitting my passenger floor board. I wrapped a thick piece of high temp silicone around that.
Even if it's not touching when you inspect it you'll see little black marks on the body and the pipes and that's where it is hitting. You should be able to lay on your back and push the y/i pipes up and down until you can locate the problem areas.




