The improved throttle response is immediately noticeable; otherwise the car behaves as stock. We witnessed a few degrees of ignition advance at the top of the rev band, as indicated by MKC's OBD-II scanner. The extra revs will further help acceleration over stock because you can now stay in gear longer, and see increased revs into the next gear. And in a car with a wicked top end like the M5, acceleration numbers will improve.
While the only drawback involves the time shipping the ECU to Powerchip and getting it back, we were able to do this whole process in less than 48 hours with overnight delivery. Unfortunately, the weather worsened, dropping 8 degrees F under our baseline test temperature, which surely hurt acceleration times on the dyno.
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