well from what i understand the six gun and speed loader are about maxed out. unless you could add more timing and find something that adds duration. because the rail pressure is already raised too high, just below 27,000psi so a pressure box is out of the question! because thats about the level the relief valve is supposed to be compromised. the powerpup adds pressure and timing but im not sure about duration. i have tried them both. the power pup is alot more powerfull but the six gun is alot more drivable. no surging and the sort.