Bad ass, I've always wanted to put a baja designs lighting kit, a bigger tank, and some wolfman luggage on my BBR pit bike. It's got the 88cc high compression top end, 107 crank, I've added a manual clutch, SP-5 front fork, extended swing arm, BBR frame, billet wheels, I could go on and on..
I've got 3 2003 XR50's that I just will not get rid of.
I raced them semi professionally locally for a few years, that was the most fun I think I've ever had on two wheels.
I had one for each class, spec class, modified, and unlimited. (49cc, 88cc, 107cc)
It would be entertaining to see how far I could get on a pit bike. What a freaking blast!