"Turbo and High Perfomance" magazine dropped a Minivan v6 into an MR2, then put a TRD supercharger and a turbo on it. Tuned right, the supercharger is for low end and the turbo for high.
The WRC was the only race series that I know of that ever had twin charging, and the Lancia that Globber was talking about made around 470HP from 1.8L (~261HP/L). There's also a Mini Cooper S that had a turbo added to it's stock supercharger in the current Sport Compact Car.
For real fun though, you put two turbos in series to produce ridiculous amounts of boost. As far as I know, there are some diesels out there that do this, but I don't know of any right off the top of my head.
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d^_^b Got my headphones on.
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