I'm a Pro-M fan, and think the Pro-M 77mm would be good for you. That has a filter on the end and is a great meter. If you want to spend the best money, then I would get an AFM power pipe and stick an 80mm on the end of that. But the 77mm Pro-M would be just fine open in the engine bay. I used to run that meter on my car when it was natural aspirated. Only bad thing is the Pro-M 77mm is about $400, but worth the money.
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