Kooks is def. what you want then. It is very quiet in the car at crusing speeds/idle. at WOT however, it is an entirely different beast. I'm kind of an exhaust whore and had quite a bit of exhausts on my 4th gen. I know what a good exhaust sounds like compared to a bad exhaust. and to be honest with you, the kooks is by far my favorite. It's quiet enough that I'm not pissing off my neighbors when I leave for work in the morning (too much), but it's loud enough to make the guy in the 370z with straight pipes yell out to me "holy shit that thing sounds mean" as I "aggressively pull away from him at a stop light"
http://s122.photobucket.com/albums/o...dclipofcar.flv
(edit: if you watch the video, the car was on a cold start, so the idle was at ~1000 rpms until about 0:50 into the video)