What does this noice sound like. I have an offroad h-pipe on my 03 cobra, and it has started this wierd noise on the drivers side, and it is most prominent when the car is around 2500 rpms in 3rd,2nd or 1st gear. It kind of sounds like something is either rubbing or loose, so I was wandering what your noise sound like. Mine is only present when the car not under acceleartion, but just letting the rpms drop back down. Peace!