Brake boost to 2k RPM (with DSC off) and let fly. Do it in DS or manual. Be prepared to shift quickly if you want the optimal experience (for 1st and 2nd, 4k is the best time to shift, as that's where the greatest amount of torque..there is a slight loss after, and it is noticeable when shifting). It takes some practice, but once you get it down, it's a blast.
If 1st goes too fast for you to shift, try a 2nd gear launch instead.