This is Holley's 170gph (PN 12-289-25) mechanical fuel pump designed specifically for the kind of power Marvin intends to make with the 427W Raptor. Shutoff fuel pressure is set for 6.5 to 8.0 psi. Bulletproof aluminum and steel construction makes this pump perfect for high rpm use. Inlet and outlet are tapped for 3/8-inch ID lines. For this kind of power, you want a minimum 3/8-inch ID line to handle the demand.