I just tested the car after switching from the tunnel ram with 2 660's to a 1150 Quick Fuel......the best run with the 2 carbs was 10:15 @ 133 mph. With the 1150, I went 10: 16 @ 136 mph. Not much difference, but the track was very slippery last night....almost lost it twice. I suspect it will run a little quicker....maybe 10:00 when it hooks.