I recently installed my megan headers, with stock y-pipe. the car came with a tanabe super mediallion racing muffler welded on to the stock piping. since I installed my headers, my car has been sounding like a civic at abover 3k rpms. so i go and check for leaks and even bought new gaskets. nope that didnt do it. so i kicked my muffler angerly and heard this rattle. I took the axle back part off and sure enough, somehow, some pieces of metal is stuck inside the packing material chamber and is rattling around. now i have to drive around with a ricey sound for 2 weeks until i get my custom exhaust done. o btw does anyone know where to get gaskets for the header to y-pipe gasket for megan headers? my stock ones leak.