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There may be some small gains to be had on an N/A engine but the real benefit is for heavily modified engines that require larger MAF and injectors than stock. Stock injectors can take you up to 200HP WD21 MAF appears restrictive BUT I have not measured any significant restriction on my cam'd 3.0. I have not tested a wd21 MAF on anything larger (yet) If you have a 3.3 swap and your vacuum gauge 0-3 HG under wide open throttle.