Sinister Diesel Billet Valve Covers for 2004.5-2010 Duramax LLY, LBZ, LMM. Fuel Pressure Regulator Developed and engineered in the

Developed and engineered in the USA

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When these fluids are contaminated it can cause premature wear on engine and turbocharger bearings or even engine failure from a lack of lubrication or overheating due to a constriction within the fluid passages inside the block and engine components like your EGR Cooler

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Sinister Diesel Billet Valve Covers for 2004.5-2010 Duramax LLY, LBZ, LMM. Fuel Pressure Regulator Developed and engineered in theThis product is Sinister Diesel's Billet Valve covers for the 2004. 5 2010 Duramax will help clean up the engine bay, and add a little more clearance for custom turbo or fuel upgrades. These are fully CNC machined, then they are anodized in the Sinister Blue color for good looks and a long life. These retain the factory Fuel Filter housing as well as the Radiator hose hard line. These DO NOT have any other provisions for wiring harnesses or