i am assuming you are on l's or p's then? by the time you get a turbo, all the piping, electrics, it will cost an arm and a leg, you would be better off just working the motor. shouldnt cost as much, and will probably get nearly the same power figures as a turbo setup. i did have a post on here a while back about a bloke i know who used a 5k in his clubman that made 200hp atw, normally aspirated.