I dont think it makes as big of a difference as what everyone seems to say/think,I ran them on a outdoor(parking lot)track,tight,not to big,car seemed to lose punch coming out of the turns,(and yes I did change the pinion for the right ratio's.. ) I was told that the low ratio pullys would help by putting the belts at a better angle(less drag)I still run them but I dont see a huge performance gain..maybe I missed something at Xray school..
But I would invest in a large set of pinion gears,not every motor likes to be geared the same..one ratio does not work on every track..
