my 450R has the HRC kit and a 13 tooth front sprocket and a [email protected] filter and i took it to the 1/8 th mile asphalt strip and my best time was a 8.905 @ 69.76 mph and i did the 60 foot in 1.635! i couldnt believe i ran that fast, i only weigh 135 LB's. whats your times??? is it possible my quad ran that fast? my next fastest run was a 9.203 @ 70.09 mph with a 2.089 60 foot. maybe that 8.9 was a perfect run or something but its still 3 tenths of a second faster than my next best run. next week im going to put my HMF "ballance" pipe on it and see what it runs then.