haha...this is awesome I was just got to start a new thread asking the exact same thing and what do you know...here is one already!
IMO currently the stock exhaust has no sound what so ever.... I have heard a strup and it is nice but I would like to hear personal opinions on the Tanabe Concept G as for some reason I feel that is the exhaust for me
I agree with awinter as adding a CAI does increase sound when accelerating.