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I know many people adding turbos and only running 5 psi on them on NA engines. Most cars can take that without an issue if you are just looking to boost MPG. It is when you are doing it for power, redlining the engine and beating on it you run into issues. Turbo is the way to go though. I supercharged my 350Z (originally an NA car) and was getting 20 mpg on it. I switched to a twin turbo setup and instantly went to 28 mpg.
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