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I don't have any knowledge on it, but just based in the setup of the m3 stock I can't imagine you would gain substantial power from camshafts. The engine already puts out more than 100hp per liter. Other NA engines out there boasting that same statistic need a lot of supporting mods to gain horsepower from "hot cams"
But like I said I'm only speculating, if anyone has real knowledge in this area they should chime in
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