i dont recall off hand, the exhaust should have came with tuning instructions. if not call or email muzzy and they'll hook you up.
i had to send my system back to them, the lower cap became loose and the pipe shook like a leaf. they took care of that, they also replaced the header, due to a failed weld. one of the port pipes broke off at tht collector. they hooked me up event though it was after warrenty expired. (muzzys warrenty last only for 90 days from the factory,can you believe that shit?)
"Winning is not a sometime thing: it's an all the time thing. You don't win once in a while; you don't do the right thing once in a while; you do them right all the time. Winning is a habit. Unfortunately, so is losing." - Vincent Thomas Lombardi