Willeyco.....True Duals....

 

I put on a full Wileyco exhaust from Italy (dual), advanced the timing 3 degrees, power commander, add fuel, K&N air filter, opened up the airbox, added orange primary spring. I have 27" mud lite XTR's on mine and carry a lot of gear. The quad rips and ties a King quad 700 in drag racing even with a 300lbs disadvantage, 27" tires and a lower primary (lose some top end)

 

I have the wileyco dual exhaust and a doebeck tfi. They have helped my atv. It has better throttle response and doesn't stumble like it did stock. I am going to advance the timimg next, probably 6 degrees.