I added a sprint booster after my x spanked me with her mustang gt in autocross, talk about throttle lag. After the change the response was totally now and I would never part with it. IT MUST BE THE CORRECT ONE, LIMITER AND SRT-6 NOT THE SAME. Now I get immediate response and I have the traction control OFF because I have the Phantom grip LSD installed and dont want a computer cutting the power mid take-off, Woody