This kit includes a new and rebuilt HPFP from APR. Features: Significantly increases the volume of fuel displaced by the HPFP by 41 % Maintains higher pressures in demanding situations Completely rebuilt in house Fully machine tested and broken in before shipping New pump included Improved, weight-matched spring DLC-coated piston Heat-treated bearing-grade stainless steel material Supports high horsepower .00004" dimensional tolerances .00005" geometric tolerances Replaced spring seals