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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 routing with an upwards/forward layout to improve access to driver-side fuel components and make room for larger turbos. The kit includes a CNC-machined billet aluminum thermostat housing, coolant pipe, silicone boots and t-bolt clamps, fits single or dual CP3 pump setups, and is finished in custom powder coat.
Wehrli 01-05 Duramax LB7/LLY Thermostat Housing Kit - Candy Red
