Just looking about and saw this kit, seems alot of gain for £1600 and runnable on standard internals (so it says) am I missing something obvious?
http://www.laurent-motors.com/en/turbo-kit/60-kit-turbo-f4r-20l-16s-stage-1-2-et-3.html
http://www.laurent-motors.com/en/turbo-kit/60-kit-turbo-f4r-20l-16s-stage-1-2-et-3.html