at about 4000 rpm i get this weird buzzy noise. had the slp catback and a catless downpipe and thats when it all started. Is it the exhaust or what? I put a resonator on it and it kinda went away but of course after it burned out it came back. anyone else have or had this problem and maybe a solution?

 

Probably just an exhaust "rattle". Not that the exhaust is loose or anything. It's hard to explain. But if its the noise I'm thinking it is, my car does it too.

 

get a catted dp