of their SZ-EXP90 Turbo Kit. For pump gas, get the 5-10psi spring actuators. You should be able to turn these up to ~23ish psi with a boost controller and race gas ofcourse. Although I wouldn't suggest more than 17psi on the stock block. The SZ-EXP90 Turbo Kit made 658rwhp at 24psi so you have rough idea of what it will do at 18psi :)