By the way... for anybody curious what it sounds like, here is my Nismo with Berk HFCs and FI CF CBE w/ 12" resonators ONLY. No other mods.
Nismo 370Z w/ Berk HFCs and Fast Intentions Carbon Fiber CBE (12" resonators) - YouTube
Couldn't really get good acceleration due to a lot of traffic, but you'll get the idea.