The fiddy flat out hauls for a stocker! Removes the flywheel and gives you the ability to adjust the timing. Takes about 2 or 3 lbs. off the crank and lets it rev out a lot faster. Might not be the a good mod for those of you spending a lot of time on the back wheel, kinda takes from the bottom end. If you're into moto-X or super motard you can't go wrong with this kit. The fiddy actually has a mid-range hit now and just keeps pulling.