Mine didn't come with an 'S' button, but rather an 'S' pedal. It's to the left of the brake pedal, and I noticed that if you turn off 'TCS', push the pedal on the right of the brake pedal (the 'GO' pedal) to the floor, then let off the 'S' pedal, the tires make a lot of noise and the car accelerates like a batouttahell.
If you wait to push the 'S' pedal momentarily when the tach shows 6500, pull the hand lever back, and release the 'S' pedal quickly, it chirps the tires again, and in a few seconds, the car is over the national speed limit. You can only do this once or twice more, then things start to fly by the window at uncomfortable speeds.
I like the 'S' pedal better than the 'S' button. :lildevil: