Quote Originally Posted by Explicit_Spade View Post
Leave your stock catback and it won't be an issue...
This...factory exhaust is quiet and is good for 350 FWHP.

Quote Originally Posted by Sudden View Post
How about noise from headers inside the car? Care to comment on brands?
My car is loud...but its all overkill...I'd say get some catless Speed Daddy headers...with the stock catback it is still very quiet.

Quote Originally Posted by SlowNA06 View Post
Shouldn't knock that hard on those mods. As much as I want to blame your PCM I've seen folks complain about the ZZP tunes plenty), I'd say to double check after you put in fresh spark plugs and clean your MAF. Also, not seeing any intake work in your sig, so throw on a 9" filter if you haven't already.
X2 on the open cone.

Also...clean your throttle body if you haven't. Free stuff rules...try flipping the dog bone mounts too so it eliminates movement...amybe something is making contact under load.