I don't mean to throw stones, but I don't see how anyone can accomplish an in car LTH install in 4 hours. I called American Racing Headers and asked them if the job takes as long as it did me or if I was just slow. They said LTH install usually takes them 6-8 hours - and I know they're professionals. Air tools and a lift will certainly help, but cutting the time in half? Just installing a grade 8 header bolt over the motor mount on the driver's side was a 1-click at a time ratchet exercise from purgatory using two swivels and a 2" extension. Then again, maybe you move like Flash Gordon...<G>