That place in Vic one of the workers has a mighty boy with billet supercharger and su no injection and he fits them to minis bmw and sports cars as well and swears by the SU carb for simplicity but also H20 injection for higher comp setups. Some are experimenting with h20 and e85 mixes as well.

Go for an efficient supercharger like the twin screw which are 70% efficient as the roots usually produce too much heat. The twin screw are the standard SC used throughout the world by most manufacturers on higher comp engines than usually boosted applications.

Try a merc or bmw mini Twin screw SC easy to get from ebay, even one almost new one sold on Ozdat for $180 about a year ago. Adjustable ignition like megajolt or a modded distributor by some expert and good tuning is a must.

Venture into mini sites in the UK and see ugly little cast iron under 998cc mini engines making 78hp at the wheels thats better than most fully worked big bore A15 engines. Even some on utoob.

https://www.youtube.com/watch?v=HqBju8QEgKg

https://www.youtube.com/watch?NR=1&v=nvHoDO--W28&feature=endscreen

https://www.youtube.com/watch?v=LW7iIXagMNo