I'm looking to get a little more boost and power from my modded r53 and it's currently running a sprintex supercharger with what I belive to be the standard size pulley ( size ,idk ) but it's making a peak of 16lb of boost. I finally found the smaller pulley for it but they don't list their increase... they have 60mm, 62mm, 64 mm, 66mm, 68mm or 70mm . Im.looking to make like 18-19lb of boost , should I go with the 62mm pulley then you think ??