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Gary,
My guess is the temperature of the compressed air (whether turbocharged or supercharged) is hotter than normal. Maybe an intercooler lowers the temperature to a level equal to the air charge of a non-FI engine.
Your question is intersting. Is there a way to efficiently cool the temperature of air on a normally aspirated engine? Other than the traditional cool air intake systems that are so popular maybe there isn't anymore benefit from intercoolers, etc.
Just a guess.
ddb
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