Just want to share my experiance with this. I have a '04 bonneville america. I pulled the air box, put on epco muflers and did a big bore kit. The guys in my triumph dealership didnt think putting on the Keihin Cr would made much of a differenece, I did it anyway ... they admit they were way off, what a difference ... it blasts from 0-60 and the high end fly's, they just needed to fool with the jetting a bit to get maximum gas millage without decreasing performance.
