I installed a set of roush axle-backs on my 15 Gt two months ago. I have only drove 1500 miles. Cranked the car up and heard what sounded like a rattling tin can from the left side. On closer inspection, the muffler appears to have separated on the inside. No problems on the right side. has anybody else had this problem? FYI I did contact the parts dealer that sold me the kit, not their problem.:fm: Now I wish I had kept the stock mufflers.