If you keep the boost at a reasonable level, then 24's or 30's will work if you run an FMU with the 190.. I say keep 10#'s & under and you should be OK.. Or just hold on to the kit and get bigger injectors and pump when time & $$$$ permits, and then install it. I had my Powerdyne for close to year before I installed it gathering supporting parts. And the though crossed my mind to sell it,, but MAN, I am glad I didn't....