Ive converted 3 automatic cars to 4-speeds. After taking them back out to the track, it was discovered that I was as consisatant as the automatic and a couple tenths faster in one car. Never lost the consistency though. And were talking 11-12 second cars. Once you learn the car and run it enough, thees nothing to it. Powershifting is no big deal either. People make it out to be more than it is in the difficulty department