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We got 337.6 whp with the ESS G1 supercharger, custom intake, water/meth, and 10 psi of boost on a 2007 Z4 3.0si. The lack of vacuum available to actuate a normal bypass valve is our current obstacle. While there are venting options available, my intention is to not run alpha-n in the future and instead run a MAF-based tune, so we are looking at electronic bypass valves.
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