All I've been able to do is ride on the street with my '01 S, but it sure is fun to ride. I'm still doing the break in routine, so I have not opened it up all the way, but I'm still impressed with the power. Did everyone follow the manuals recommendation's for break in? When I'm crusing at about 35-40mph, in 5th gear, there is either transmission noise or a lugging sound coming from the engine. The manual shows a shift from 4th to 5th at 31 mph. It just seems to be lugging the engine.