Diesel fuel injectors for Chevrolet / GMC Duramax LGH 2011-2014. This is the fifth version of the Duramax 6.6L engine that General Motors used in the G series of GMC Savanna and Chevrolet Express G series trucks. The diesel fuel injectors used in these engines are Bosch piezoelectric design. TamerX offers Bostech diesel injectors and genuine GM injectors for this application. Warranty: GM offers a 1 year warranty, Bostech offers a 1 year unlimited mileage warranty. The Bostech injector is a premium remanufactured injector and is our best seller. Bostech remanufacturing process: 1. The injectors are completely disassembled. 2. Ultrasonic cleaning. 3. Solenoids are tested to determine if appropriate OHMs are replaced. 4. Injector mounted with computerized measuring device. 5. Genuine Bosch nozzles. 6. Original Bosch control valve. 7. Seals are replaced. 8. Injector calibrated in the Nova Ditech computerized flow simulator using OEM specifications. 9. All injectors have a unique serial number to complete the tracking capacity. The remanufacturing process is carried out in a clean room environment with controlled temperature.