Fleece High Pressure Injection Line (#4 & #5) For 04-05 LLY 6.6L Duramax Diesel transmission Modified valve body versions available

Modified valve body versions available for many popular calibrations

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Fleece High Pressure Injection Line (#4 & #5) For 04-05 LLY 6.6L Duramax Diesel transmission Modified valve body versions availableThe LLY Duramax High Pressure Injection Line 1 and 8, from Fleece Performance Engineering, is a high quality solution designed to optimize the fuel delivery system in your LLY Duramax engine. Specifically engineered to fit LLY model Duramax engines, these injection lines ensure a precise and reliable fitment. Crafted with precision and durability in mind, these high pressure lines are built to withstand the rigors of high fuel pressures and deliver