ok, i am getting a phat shaft 64/14 for sure now. how do the ddp injectors match up with this turbo? (stage 4s). or stick with mach 4s? reason im asking is because of price difference. also, the mach 5s, why do you not recommend them for use with my setup? are they too big? thanks for your help! i think im starting to go down the right track for the right hp setup!