a std bike with tyres/suspension is all you need. rearsets, brembo master cylinder and decent pads and some pattern bodywork if your feeling flush and your good to go. unless you have pots of money and can afford a bsb engine/huge rad/bst carbon wheels and ohlins/brembo monoblocks... it all looks very nice in the paddock but its not so cool to have a duffer in his late 40's lap 3 seconds quicker on his k3 gsxr with nothing but suspension setup and a power commander! you will love it though.