I ran a used PTC in the cuda for a year then went to Dynamic, Called Frank and told him what I had, he sent out a custom unit that has been great for the car, 8" 5100 stall street use, best 1.36 60' with street tires and exhuast. I would use him again if I build another auto car. there was 3 tenths diff in ET, the dynamic being faster...Phill