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I finally had a chance to drive my m3 a few times. Like mentioned previously, seems to run smoother in the lower rpms and more pep in the mid range. Feels like it picked up power up top, but i haven't driven this car much since i bought. 10 to 20 hp is realistic. Lastly, gas mileage has increased 1-2 mpg, even with driving the car harder for testing. I'm very happy with what i got for the money.
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