OP, my recommendation for you would be a Garrett GT3582rs. Would meet or exceed your power goals at 15lb of boost, using the .82 turbine housing and stock s50us cams.
If you're running cams far more aggressive than the M3 cams (and a higher redline), look into the 1.02 turbine housing. Would move the power delivery higher into the revs to match.
If you're running cams far more aggressive than the M3 cams (and a higher redline), look into the 1.02 turbine housing. Would move the power delivery higher into the revs to match.
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