Yes we put our friends kx450f 2013 up against our k5 on the tar ,so traction was the same,the k5 started from behind and went past it on the back wheel ,mind you the 450 was stock and the k5 has a balanced and windowed piston,a good stock k5 would of creamed it as well,mind you at my own supercross track ,were it tight and jumpy ,the 450 would kill it with it better power off the bottom and instant response off idle,our 5 in a 250 01 frame so handling close but the 450 has better suspension but guess what the 450 forks and wheel will bolt straight on the 250 01 triple clamps ,so will be testing this set up when we have spare time,as i spent a bit of time on the 13 450 and are a good fork,comparing to the 250f 13 forks which are on the hard side but i have revalved softer in the first half of the stroke.Guess what they did the same thing on the 14 250f kx.