The ARK Exhaust is Loud I mean Really loud, Also if you plan on going with Test pipes you will not be happy the howling noise is unbearable...
HKS has a great sound and doesnt really have any hissing noise no drone at normal driving RPM's and sounds great under load at WOT (Wide open Throttle)
Listend to the Video Clips that I posted earlier and see for your self, just make sure its on a good set a speakers
DAN