I'm with Michael on this one.
I believe that Turbos are more efficient, a supercharger robs quite a bit of horsepower (in comparison of course), however,
since a SC is driven off the crank, as soon as the RPM's go up, so does the power.
So for an autoX engine, SC is the way to go, for drag and/or road racing, Turbo is probably the best solution.
As to the 'bolt on' statement, yes, a SC is easier to install, because there is not piping from the exhaust etc to install, however, depending on how much boost you run, you still need to (re)tune you engine, mess with the ECU, fuel pressure, timing, etc.
Rob.
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