You'll notice no driveability issues with a tuned car in eco and comfort modes with a flash. boost kicks in the same way etc. shifting is the same.. it will feel the same except at full throttle etc.
Bm3 and forget it.
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD
2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots
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