After torqueing them right I've hit 60 lbs. of boost so far. Still have quite a bit of pedal left. The extremes are suppose to be of the same quality as the better arp's and A1's. I torqued to 135 ft. lbs. and went over them twice. The first time a few moved the second time none of them moved. I also did a cold retorque a couple days later on the ones I could get to and none of them moved.