I'm not sure I've seen any failures in the car that are power related - anecdotally speaking Stage 1 kit cars are no less reliable than standard cars for instance. Similarly I don't think the rear tyre has a traction issue (again even in Stage 1 cars) other than in first, so a bit a of scope for more power with a careful right foot in the low gears. That said, quite how fast you actually want to go in a M3W is another question.
I'd certainly be willing to have a go in a supercharged one and keep an open mind.
