Registered Forum User
Mille
Posts: 145
Join Date: Feb 2005
Location: Hastings, East Sussex
Reading the moto - one stuff and Ian Falloons book it appears that the critical ratio is the valve vs header diameter. Since the later 888s and the SP2/3 have the same valve sizes and the SP2/3 exhaust has 50mm headers, this seems to be the way to go for a cost effective power increase.
Douglas