Wehrli 01-05 LB7 LLY Duramax Thermostat Housing & Upper Coolant Pipe Kit - Illusion Blueberry

If you're working on the fuel system or upgrading the turbo on your 2001-2005 LB7 or LLY Duramax, this Thermostat Housing & Upper Coolant Pipe Kit from Wehrli Custom Fabrication is a smart upgrade. It replaces the stock upper radiator hose and coolant return pipe, rerouting coolant flow upwards and forward. This change makes it much easier to get to the driver side fuel system components and opens up space for larger aftermarket turbochargers, especially the race cover or SXE style turbos.

This kit is CNC machined from billet aluminum for a strong and well-built housing, then finished in a striking Illusion Blueberry two-stage powder coat. It includes the coolant pipe, silicone boots, and t-bolt clamps needed for installation. This updated routing not only improves access but also gives your engine bay a cleaner, more modern look. It's compatible with both single and dual CP3 pump setups, as well as factory VGT style turbochargers.

Replacing the OEM parts (GM Part numbers 15792832 and 15198345), this kit is made in the USA and is a popular choice for Duramax owners looking to improve serviceability and aesthetics. It's a solid option if you're planning on significant modifications to your cooling system or turbo setup.