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.
Current: 13 M5; 02 M5, 14 X5, 06 M3, 05 M3, 15 I3.