I used to use 20/10/10 9 paddle haulers and thought they were awesome. Then I got some 22/11/ something cant remember 8 paddle haulers and I will not ever go back to a 20. My top end with stock gearing is awesome. My buddy has a YFZ 450 with web cams, aftermarket exhaust, rev box, stroked and 21 inch tires. In a 300 ft race he takes me by about a quad, in a long race he takes me by two or three. I have toomey T6 pipes, timing plate, clamp on K&N's and a shaved head. Tires heigth can make a big difference in a race.