I have thought about this a lot and the conclusion is that if more power than a plus4 is required and you don't want higher annual tax(in Ireland the difference between a plus4 and a 3.7 Roadster is €1500 PER YEAR!)then the solution is to either fit a set of throttle bodies or get Chas Windridge to fit a turbo!!
I'm going to leave my car as standard as the insurance co quoted me an extra shed-load if I do either
