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While you are waiting. Go ahead and download the BMW app. It runs through your connected drive if you have the Apps package on your car. You can do either launch control or the method I use is power brake it then let if fly. Right now in best conditions, temperature, road, tires warmed I can hit 4.4 seconds repeatly; have seen 4.3 only once. Let us know what your new tune can give you since the temps are cooler now.
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