'04-06 R1 throttle tube bolts right in.. '06-up R6 with just a little relief inside throttle housing...
Just did this last weekend with mine. the r1 throttles and r6s throttles are 1/5 turn, the 2006+ R6 is 1/6. I like mine very short throw for the track, just cut out the housing about 3-4mm on the bottom side and it will fit fine. You may have to move the nut on the throttle body cable to get enough slack, however.