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If I remember correctly RPI had ram air scoops on the E60 M5 and they gained around 30bhp with that. The Gruppe M has similar scoops and I am quite sure when you get to higher speeds (not dyno) you will get a lot more air into your engine. I wouldn't be surprised to see at least 30 bhp on an F10M5. I hope someone will have the chance to measure the increase, and we have a realistic verdict.
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