WEHRLI CUSTOM FAB WCF100405 2001-2005 LB7 LLY DURAMAX THERMOSTAT HOUSING & UPPER COOLANT PIPE KIT

Product Description

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The WEHRLI CUSTOM FAB WCF100405 LB7 LLY DURAMAX THERMOSTAT HOUSING & UPPER COOLANT PIPE KIT is a premium cooling system upgrade engineered to improve coolant routing, engine bay accessibility, and turbo clearance for 2001-2005 GM 6.6L Duramax trucks. This kit replaces the restrictive factory upper radiator hose and coolant return pipe with a CNC-machined billet aluminum thermostat housing and fabricated coolant pipe that reroutes coolant forward and upward from the thermostat.

This revised routing layout eliminates the factory hose crossing over the driver-side valve cover and opens up valuable space around the turbocharger and fuel system components. The design is ideal for trucks running upgraded turbo systems, race covers, or dual CP3 fuel systems where clearance and serviceability are critical.

Constructed from high-quality billet aluminum and heavy-duty fabricated tubing, the WCF100405 kit improves durability while giving your Duramax engine bay a clean, high-performance appearance. The system installs using supplied silicone boots and stainless T-bolt clamps for secure sealing under high boost and demanding operating conditions.

Key Features

• CNC machined billet aluminum thermostat upper housing
• Replaces OEM upper radiator hose and coolant return pipe
• Improved coolant routing for easier access to driver-side engine components
• Creates additional clearance for larger aftermarket turbochargers
• Compatible with factory VGT turbochargers
• Works with WCFab Dual CP3 fuel system setups
• Durable silicone boots and stainless T-bolt clamps included
• Multiple powder coat finish options available
• Manufactured in the USA

Fitment

• 2001 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
• 2002 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
• 2003 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
• 2004 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LB7
• 2004.5 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LLY
• 2005 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LLY
• 2001 GMC Sierra 2500HD / 3500HD 6.6L Duramax LB7
• 2002 GMC Sierra 2500HD / 3500HD 6.6L Duramax LB7
• 2003 GMC Sierra 2500HD / 3500HD 6.6L Duramax LB7
• 2004 GMC Sierra 2500HD / 3500HD 6.6L Duramax LB7
• 2004.5 GMC Sierra 2500HD / 3500HD 6.6L Duramax LLY
• 2005 GMC Sierra 2500HD / 3500HD 6.6L Duramax LLY

What’s Included

• Billet aluminum thermostat housing
• Fabricated aluminum upper coolant pipe
• High-temperature silicone boots
• Stainless steel T-bolt clamps
• Installation hardware

FAQ

What problem does the WCF100405 solve?

This kit eliminates the factory upper radiator hose routing across the driver-side valve cover. By rerouting coolant forward from the thermostat housing, it improves engine bay accessibility and creates additional clearance for turbo upgrades and fuel system components.

Will this kit work with aftermarket turbo systems?

Yes. The coolant routing design improves clearance for many aftermarket turbochargers and is commonly used when installing larger turbo setups or race cover configurations.

Is the kit compatible with dual CP3 fuel systems?

Yes. The WCF100405 is compatible with WCFab dual CP3 configurations and helps create the clearance needed for advanced fuel system upgrades.

Does this kit add horsepower?

This product primarily improves coolant routing, engine bay access, and durability rather than adding horsepower. It is typically installed during performance builds or turbo upgrades.

Is professional installation required?

No. Installation is straightforward for experienced enthusiasts using basic hand tools, though professional installation is recommended when performing additional turbo or fuel system upgrades.