I am running a 904 BB and I definitely gained with the BB but I want more. I just don't know which setup to go with, I know Dinqua and Biker are running the Mikuni's with good results but I am thinking about trying something different and leaning towards the FCR's. I also would like to see someone come up with a good set of cams but it sounds like it is hard to improve on the original equipment. I am still doing some research and need to make a decision soon.
