You could run a 3.2 with the right tune. But smaller pulleys don't exactly mean that you making more power, its good that your thinking about going with a bit larger pulley and then try to add some timing to it to make power. I would say go with the 3.3 and then get a good tune, 3.2 at the track with racegas. Below a 3.2 and your looking at 42# inj.