Here are the the steps you need to do if you really want to consitantly squeal the tires.
1.) hold traction control button for 5 seconds to completely disable system
2.) depress brake pedal
3.) with brake pedal depressed, similtaniously lightly press on gas pedal to bring RPMs to about 2,000 (this will spool the turbos)
4.) stand on the go pedal, release the brake pedal, and hold on.
If you follow these steps it'll light em up every time. If you just stand on it from a dead stop you'll find your results will be very inconsistant, at least this is what a little bird told me, lol.