Ahhh, that makes sense. Thanks black, What do galfer rotors have over stock?(black954 @ Apr. 11 2007,05:35) I believe the R1 has a 2 piston rear caliper vs. the busa's 1 piston. Also, the R1 has roughly 100 less pounds to stop. And, R1's have a Brembo rear master cylinder. All this equals much better braking than the busas unchanged brake technology from 1999.