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The Wehrli top-outlet billet thermostat housing and upper coolant pipe kit for 2001–2005 Duramax LB7/LLY replaces the stock upper radiator hose and coolant return with an upward-forward routed assembly to improve access to fuel system components and clearances for larger turbochargers. Kit includes CNC-machined billet housing, coolant pipe, silicone boots and t-bolt clamps, and is compatible with single and dual CP3 pump setups; finished in your choice of powder coat.
Wehrli 01-05 Duramax LB7/LLY Thermostat Housing Kit - Candy Teal
