I have one with the JBD tune in it. Ran my friend's e92 from a light and freeway just for comparison. Both times I got a decent jump with around 500 ft/lbs of tq, but he ended up cathing me and passing me. I recall seeing couple time slips of 335d with a tune and drag radials doing 12.6 in the 1/4 mile so ultimately it is a cool car that's fun to drive every day because of instant tq, but BMW built the M3 making sure that no other 3 series will be a competition stock for stock.
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E60 M5, E39 M5, E46 SC'd, F15 Diesel
2013 M5 Azurite Black.....1/4 mile F10 M5 firstname.lastname@example.org 1/2 mile 160.7mph