I just purchased an 06 TLE Polaris Predator. I have piped it, added a K&N filter with 11 DG easy breathers added to the air box, I'm running a Dyno jet kit at 146 with new needle (running at 4000 feet above sea level), with gearing at 13/38. I have a rev box as well.

I took it to the dunes and my Suzuki Z400 ran circles around me with a heaver rider on my Z400.

What is wrong with my Predator? Does anyone have any ideas? Is that normal?