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It all depends on the quality of the launch control and therefore obviously on whether or not the launch control in the US is identical to that in the rest of the world. BMW has been known to offer different LC systems in the US compared to elsewhere. Next the gains from DCT will depend both on the shift times and the gearing changes if any. 0.2 seconds gain is a good guess if LC works really well. The 4.1 number seems too fast for the cars weight, power and gearing, so I'd say that number is sort of an outlier. That being said since we saw it, it is also likely an outlier number for M-DCT could be 3.XY.
Last do search around on the forum - this has been discussed ad infinitum. Use google to search the forum rather than the built in search feature just add site:m3post.com to any google search.
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