I installed my new nismo exhaust this weekend and the muffler is hanging a little lower on the left than the right, or its too high on the right side. Basically, the rigjt tip is touching the bumper and the left isn't and I think when the tips move a little while driving its hitting the bumper causing a weird noise. Any suggestions?

 

pull the muffler off and bend a hanger.

 

Re-install the exhaust. Remove eveyrthing from Y pipe to muffler, put some wd-40 or pb blaster in all of the rubber hangers. Adjust the hangers in and out so that the tips are even. For me, i had to move the 2 hangers on the right side of the muffler all the way out, and push the left hanger all the way in. 2 hangers being passenger side, 1 hanger on driver side.

And the tips are not supposed to move while driving. If it moves, it means you didn't tighten it enough. But be careful not to overtighten...

 

Well I'm not sure if its the tips moving that's making the noise. When I'm in first gear about to take off is when it sounds like something back there is ratiling.