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The Wehrli top-outlet billet thermostat housing and upper coolant pipe kit for 2001–2005 Duramax LB7/LLY replaces the OEM upper radiator hose and coolant return pipe with an upwards and forward routed assembly to free up space around the driver-side fuel system and allow larger aftermarket turbochargers. It includes the billet aluminium thermostat housing, coolant pipe, silicone boots and t-bolt clamps, and is compatible with single and dual CP3 pump setups; finished in custom powder coat.
Wehrli 01-05 Duramax LB7/LLY Thermostat Housing Kit - Bronze Chrome
