Yes! Do the airgap! I switched the other way in preparation for a blow thru turbo setup, and lost power. My 60 ft times went from 1.60-1.61 with the airgap to 1.67-1.68 with the M1, a definite loss of torque. The mph is about the same, but I no longer have an 11 sec car. I'm a little bummed about it, but daydreams of turbocharged awesomeness keep me from going too crazy.