With the 996 turbo (Tiptronic) there is a way to accelerating from 0 - 100 in 4.2 sec
,the 996 X50 (Tiptronic) in 4.0 sec
and the cayenne turbo (tiptronic) in 5.6 sec
using my stopwatch !!!
about the 996 turbo and the x50 you can do that by
1-switch off the PSM
2-but the gear on the 2ed gear
3-hold the break as hard as you can
4-accelerate while braking (dont worry it wont move because of the 4 brakes)
5-but the gear on the 1st when the rpm is about 3 and relese the brake in the same time
and for the cayenne turbo
do the same but keep the gear in the 1st from the beggining