Like I said turbo-back. And I like hearing it at Idle, as long as its not droning and obnoxious its cool. Or at least quiet at idle and start to hear it with the slightest of throttle. I dunno, I don't like crazy loud, but I like to be heard when I wanna be heard, and I like the exhaust note to be deep and throaty.
Again. Turbo Back is a must. With optional cats and stuff.