I have had an after-market exhaust for a couple of months now and when i drive on bumpy roads or sometimes just out of no where it sounds like its banging against the heat sheild and i'm not sure what to do about it. I think it is becuase it has to much movability. I have the stock rubber hangers and I'm wondering if i got stiffer aftermarket ones if you think it would fix the problem. ANY ADVICE???