set of high performance 40, 75 or 100 horsepower Powerstroke injector rebuild kits. These kits will add up to 100 horsepower to your existing engine, depending on which ones you order. PLEASE NOTE ON YOUR ORDER WHICH HORSEPOWER KIT YOU DESIRE. These nozzles/rebuild kits come with the internal and external gaskets need to rebuild the injectors. We also provide an exploded breakdown to assist in the assembly of the injectors.