I am upgrading my 650L I have a FMF power bomb, Q2, air box mods,K& N,uncorked,De smoged, Dyno tuned and I want more powwer. I am adding a 10.5-1 piston, strage 1 hot cam, head work, and I want to add a 41mm. flatslide Keihin pumper carb. I want to retain the air box. Witch Keihin carb or kit is best for my bike and where in San Diego area can I buy the carb kit. Thanks Craig Hammerin Hammon.