I had a rub on the tail pipe section as the hanger back there was very close to the body. During shut down there was a very noticeable rattle sound which I fixed with some shims and loosening and retightening the hanger nuts and bolts once positioned a little further in towards the center of the truck. I didn’t have the same rubbing as Ikarus did near the front. I have the RSS model and it is nice and loud. I love it.