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BMW posts 4.3s 0 - 60 for the 550i xDrive. I'm assuming this was achieved with launch control? Otherwise, I assume they would have taken credit for the fastest time they could achieve with it. Most pros seem to "launch" the cars by bringing the RPMs up into the desired powerband, regardless... so this feature seems to simply automate what a skilled driver would otherwise attempt to do... and make it very repeatable!
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