This injector referred to as a "split shot" injector is to be installed in #8 cylinder to reduce engine noise associated with that cylinder in the 2002-2003 T444E engines. It is a new OE injector-not an aftermarket "will fit" or rebuilt. It is the same as what originally was installed in the engine when the vehicle came off the assembly line. This injector can be identified by the "AE" code on the solenoid. Alliant Power is the exclusive supplier of brand-new, genuine original equipment, HEUI fuel injectors for 1994-2003 T444E T444E ESN 1313828-5999999. WARRANTY: Alliant Power injectors are warranted for 13 months/unlimited miles. The warranty period commences the day the product is delivered to the original consumer/purchaser. Alliant Power warrants that it will replace, free of charge, any product which, under normal conditions of use and service, proves to be defective in material or workmanship and is within the warranty period. CORE CHARGE: A core charge of $250.00 will be applied to your credit card account, if the core is returned within 30 days you will receive credit. Feel free to call our parts department at 800-891-8038 with any questions.