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You will probably destroy the transmission, or other items in the driveline. Someone recently posted that they snapped the half shaft in the rear, just by going around a corner, after similar mods. The engine components such as the pistons, head gaskets, cylinder heads are not designed for this level of power also. The transmission is especially suseptable to damage from tuners because BMW cuts the ignition during shifts to preserve transmission life. Buyer Beware because you no longer have a warranty.
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