2 step doesnt do anything on an automatic trans car. Its beneficially on a manual trans car because you can hold the gas to the floor and have the RPMs limited at the point you choose to be best for your launch. On an auto trans you can only do that if your doing a neutral drop which is a terrible idea. When you launch an automatic car you just hold the brake pedal to the floor and hold the gas as far down as you can without the car moving forward then mash the gas and release the brake when you launch.
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