Can you even do that? Most of the braking is coming from your front brakes. How would you even get wheelspin with the brakes engaged? Or are you talking about the e-brake? I don't know what to tell you about launching an ATX.

99 Black SVT -3L Hybrid w/.5mm overbore, Spec clutch/flywheel, MSDS, BAT intake, K&N open, 17'Konig Tantrums, DMD, Opt. TB & Y, Powerslots, Bassani w/ magnaflow res. 96 SE MTX- "The War Wagon" "I'm in love with my car..." -Queen