I ran a 12.80 with only 106 mph....I also ran a 12.69 @ 114 mph... Both 60ft were about the same. I think my 3rd to 4th shift was very late on the 12.8 run... hence the low mph.
"We feel that the power pulley is a bad way to get extra power from and engine and the potential for serious engine damage is too great.".............Steve Dinan