Mine let go too... It wasn't rubbing any lines though, just making a banging sound on startup. I would imagine the 'banging sound' was the pipe hitting against the hole through the fender wall. I complained about the banging noise during an oil change, at the dealer, and they found it. Basically, that rubber bushing is glued to a bolt, which threads into the frame; and your AEM CAI bolts to the top of it. I just 2-part epoxy'd it back together and called it a day. Pretty stupid design IMO.