Trüpower 2001-2004 Chevy/GMC 6.6L HD LB7 Duramax diesel common rail fuel injectors are manufactured with high-speed steel using advanced processing & testing equipment, adhering to strict quality control guidelines and OEM specifications to ensure superior injection timing, atomization, bulk mixing, air utilization and injection quality. Our engineers have more than 20 years experience manufacturing diesel injection systems and common rail system components which has allowed us to produce injectors that will ensure durability, quieter performance, improved fuel economy, higher torque and lower emissions. We don’t believe in overkill when it comes to product quality so all of our diesel fuel injectors have been thoroughly performance tested in our manufacturing facility and at GCL Diesel in Edmonton AB, Canada. Trüpower diesel injectors are durable, perform equal to or better than any OE injectors on the market, are cost effective and are backed by a 1 year warranty.