I yanked out the ATI and put in an all aluminum Neal Chance bolt together deal. My 60 foots went from 1.17 to 1.06. Quarter mile went from 7.0 to 6.8
It was real expensive but a beautiful piece of machining work. Being able to dismantle it and clean it, adjust the stall etc has been great.
Marty Chance is a great guy and willing to give good advice.