The Rotrex route is the way forward as people have said. Compact, versatile, efficient, excellent value for money compared to other superchargers. I have seen them produce 500hp on an R32 and 600+hp on an R36, the chargers dont even break a sweat either. Run luke warm even at full chat. Easier on the transmission than going the turbo route also. The boost is so smooth and progressive, making the car so drivable. If you have any questions just let me know. Alex