they didn't put a slipper clutch in it for drag racing purposes. Kawi knew they were building a bike for the 1/4 mile. The 08 busa has a slipper and many busa riders get a clutch mod to eliminate the slipper so you don't fry your clutch at the strip. but if your into corner carving and not really a drag race kind of guy then the slipper would be nice. here is a link to the brocks ultra clutch mod for the busa so you can see what I'm talking about
http://prostores2.carrierzone.com/servlet/brockracing/-strse-1263/Ultra-Light-Clutch-Mod/Detail
07 black and blue tear away 14, brock's parts: alien head full exhaust, front end strap, ceramic wheel bearing, brock's quick change lowering links. pulled flies, speedo healer, muzzys timing advancer, muzzys block off plates, K&N,+1 rear, pirelli and the list goes on but is classified from there.