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That's about right. When I ran that setup I was making somewhere in the range of 600-650 crank horsepower. The BMS Stage 1 is giving you the most gains, while the RPI might net you a few hp, but the Gruppe M Intake might be causing hp loss or no gains, those things are really just for looks. The stock intake with the charcoal filters removed give you the same as Gruppe M.
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