Magnesium stacks can be bored out for the 3.0RSR race engines. You can make the MFI work for whatever horsepower, it just depends on how much you want to spend. 
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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