I was just wondering which turbo would produce the most HP on pump gas/no alchy. I know a bigger turbo will make more HP at higher boost, but will the biggest one also make the most HP at 15-17 psi? I'm trying to setup a combo for my daily driver 87 GN. Have a 3200-3400 stall 9x11 and will be rebuilding the engine pretty close to stock (maybe a little bigger cam and ported heads). I'm thinking some sort of ball bearing turbo will be the best for the street?