I wish I had the names of who it was, they sure were ranting and raving about only being able to run 13s. I hit 12's and it hit them hard and there was STILL room to go. I changed my shift points to about 6500RPM from 7000RPM and in second gear it appears as though it hurt me. My 1/8mi MPH was lower on the second run. Maybe shifting at 7000RPM for 1st and 2nd and then shifting for 3rd at about 6500 will proobably do the trick for mid 12's. Wrenching off 0.5 - 0.6s shouldn't be a problem at all. 11 seconds, here I come.