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What's the temperature, humidity, DA, PA, octane, RPM, ect.... Are you measuring the power at the wheels or the crank? You can take the same car, dyno it on 2 different days, and get 2 very different numbers. I would say be conservative, take whatever number they tell you and subtract 15%, and that is roughly what you are seeing at the wheels.
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2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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