difficult and time consuming but you get a choice of cams. 1/4 (stock), 1/5, and 1/6. air box has to come apart and that isn't much fun, but once your done it's a blast. I'm using the 1/6 the 1/5 was just to close to stock for me. no more choking up to get W.O.T that's for sure.
getting the air box lid off is a pain in the ass, cause the front screw is blocked by the frame. had to pop the box out of it's rubber rings to get to the front screw. I left the front screw out so next time it wouldn't be so difficult to work on.
the other pain in butt was that the cables were thicker so you have to open up the holes where they enter the air box. there is some real small parts that are hard to hold onto where the cables attached to the throttle bodies. and then getting them adjusted is fun too. but once it's all done it's a hoot