X2
A lot of ET racers build a motor that makes the car go too fast. They use a throttle stop to keep the car from going into the next et bracket that requires a beefier cage or expensive safety equipment. As long as you heat the tires the same, stage the same and shift the same your et's will be very close to the same. No need to build a different engine or replace the converter or have someone fab a restrictor plate. (Those guys turn left and you don't want to do that) LOL