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BMW claims from bmw performance RPM performance is heightened and engine performance is increased by up to 5hp and 3 ft-lbs of torque at 6600 RPM.
Dinan claims Maximum Horsepower Gain 6 @ 6600 rpm
Maximum Torque Gain 5 lb-ft @ 6600 rpm
basically both are full of shit, but all i care about is the sound and appearance .haha
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