The Mini-S has a supercharger from the factory. Add a turbo to the exhaust manifold and you have a super-turbo (twin charged). I think there are even kits for the Mini, since it's a pretty popular idea. VW was talking about building a 1.8 liter twin-charged diesel for the Golf a few years ago. I don't know if it ever got off the ground, but the goals were about 250 hp and torque, and about 55 mpg. That would be a killer little motor.
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