Robbo
Try and find a monkey bike, they fit in the back of a car, and if you really like fettling you can spend a furtune on go faster kit. One guy turbo-ed,and nitro-ed his with Yoshi exhaust, upped horse power from 3.5 to 30. Cost him £16000 though
. In terms of percentage HP gain it's a bargain, if your into monkey bikes, and slightly mad.