I like to use the skinny pedal.
...but seriously, best launch for this car (sans modifications as alluded to by Greek in his link to a LSD thread) is to put it in second gear, brake boost to about 2k and let off the brake, modulating throttle for traction. After that, your shifts are about at 4k rpm. If she's a slouch off the line, there's something wrong.
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Join BMW CCA
! (Use my link and I get credit