The software for auto trannies makes the "transition" from gear to gear faster and "snappier" instead of slow and more luxurious. Also shift points are raised higher. Your gas mileage will go down because of this.
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Mods: M50 intake manifold, BFP CAI, Fan delete, CDV delete, Clears all around, M contours, Clutch stop, Debaffled exhaust, CF BMW emblems