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The Wehrli Top Outlet billet thermostat housing and upper coolant pipe kit for 2001–2005 Duramax LB7/LLY reroutes cooling flow upward and forward from the thermostat to free driver-side engine access. The kit replaces the OEM upper radiator hose and coolant return pipe, fits single and dual CP3 pump setups, and includes coolant pipe, silicone boots, t-bolt clamps, CNC-machined billet housing and custom two-stage powder coating.
Wehrli 01-05 LB7 LLY Duramax Thermostat Housing & Upper Coolant Pipe Kit - Illusion Blueberry
