The 3.0TFSI HPFP is an integral part of the direct injection fuel system and provides exceptionally high-pressure (exceeding 2900psi) to the injectors. When running dual pulley upgrades on ethanol fuel, the stock HPFP internal volume becomes the limiting factor. IE's HPFP internals install into your factory pump housing and increase the bore and piston size of the pump internals, allowing more flow, delivering more fuel, and allowing for more horsepower & torque.