I told you guys how I thought my K&N didn't do a damn thing performance-vise, well it was also the day that the temperature dropped off the deepend. The pressure in my big tires was only 12psi, no wonder the poor tractor didn't want to hit 60 any more. I put it back to 17 and wow, it really moves. I actually reached cruising speed from 35 going up a steep 2 mile hill. I love this tractor