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I can't think of anyone that has tried. As a goof I stuck a 3.4 intake and throttle body, along with a 3.8 exhaust manifold on my 2.7 rallycross boxster. I haven't gotten it on a dyno but I can tell I lost some low end torque and think I gained HP above 4500rpm. Those 2.5/2.7 heads can't flow much. I don't think you can run 3.2/3.4 heads on a 2.7 either. You'll have better luck for cheaper upgrading to a 3.2 or 3.4
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Woody
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