the most boost ive ever seen outta a jrsc is 15 lbs, but that pulley was custom fabricated. i think 10 lbs is the most they make. the car with that was a gsr, and had every other mod possible. it was pushing out a little over 280hp to the wheels and running low 13's on street tires. superchargers have aftercoolers, not intercoolers....just for the record.