when i had mine i ran 230bhp @10psi and the compression was down 2bar in the one cylinder (bought it like it. i didn't know what the problem was till i stripped it down. melted piston). i was running a stage 3 head, cam ect. but i would get a fifth injector if to want to run more, it will be capable of 250 quite easy with intercooler and stuff. i have a fifth injector controller lying about somewhere ill check it still works if your interested.