Quote Originally Posted by DirtyMechanic View Post
droning is your exhaust NOT test pipes. and rattling is cheap resonated test pipes which say remove rasp and drone. which they dont do either. just test pipes that a pipe nothing more is the way to go. ive been in the VQ area for a very long time. built them up and torn them down. 650whp+ i know it all...

agree, agree, and agree.

Nothing's wrong with TP. I ran custom headerback on my G35 with Headers and mine doesn't have that much rasp compared to others with HFC + catback. It's all in the design of the exhaust.

X02 aren't bad exhaust. They copied HKS design because it works (reduce drone and rasp). HKS = higher pitch while X02 = deeper tone. X02's welds are also good. Nothing's bad about them. If anything, it's their mufflers and their quality vs HKS.

Can't go wrong with either.