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Originally Posted by ILSMKU
Did I read that correctly? A stock M3 will make 375+ WHP? That seems high.
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Given 414 crank HP and 15% drivetrain loss, a stock M3 should theoretically put down 355ish hp to the wheels in stock form. The dyno operator told me that most of them dyno around 360ish horsepower on his dyno. It's a Dynapack, so it might read slightly higher given the rear tires and wheels are not on the car for the testing. We have 91 versus 93 which is also a consideration. A dyno expert would be able to give you a more definitive answer on this.
Personally I've seen them make 305-350 stock, and this was my first time on a dyno that removed the rear wheels.