You won't have a problem beating a '10 5.0 with just a tune either way. I sprung for the 6MT in my 2010 135i. The steptronic in the 08-10 135s is like .1-.2sec faster in the quarter mile with equivalent mods on average, and the DCT in the 2011+ is even faster, but the feeling of rowing through the gears is well worth the loss in shift speed.
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