Fits select Subaru EJ series engines.

The Torque Solution High Flow Billet Thermostat Housing is a precision-engineered upgrade designed to replace the restrictive factory cast unit. CNC-machined from high-grade 6061-T6 billet aluminum, this housing provides a significant improvement in durability and corrosion resistance compared to OEM components. The high-flow internal design optimizes coolant circulation, making it a critical cooling system modification for high-performance Subaru EJ20 and EJ25 builds that experience increased thermal loads.

• CNC-machined 6061-T6 billet aluminum construction
• High-flow design for improved cooling system efficiency
• Direct replacement for the factory cast thermostat housing
• Engineered for a precision fit and leak-free seal
• Manufacturer Part Number: TS-SU-755HF

Fits 1998-2018 Dodge and Ram 2500/3500 trucks equipped with the 5.9L or 6.7L Cummins diesel engine.

This WCFab X Fleece Performance Engineering Thermostat Housing is a direct-fit replacement for the factory coolant elbow, providing a significant aesthetic and functional upgrade over the original cast unit. Designed as a bolt-on solution, this housing features a gloss black powder-coated finish and includes an integrated port with a plug, allowing for custom coolant routing and auxiliary sensor placement. This part is a direct replacement for OEM part number 68145495AA and is manufactured in the USA to ensure high tolerances and reliable performance under high-stress cooling conditions.

• Direct replacement for OEM Thermostat Housing (P/N: 68145495AA)
• Integrated auxiliary port with plug for custom coolant routings
• Durable gloss black powder-coated finish
• Matches WCFab intake kits and intercooler piping
• Compatible with 5.9L and 6.7L Cummins engines
• Note: 2007.5-2012 models may require additional hardware (PE-CUMM-EBP-KIT-0712) for installation
• Manufacturer Part Number: WCF100157-GB
• Made in the USA

Fits select 2014-2020 Chevrolet Silverado/GMC Sierra 1500, 2500HD, 3500HD, Tahoe, Suburban, Yukon, and Cadillac Escalade (4.3L / 5.3L / 6.2L / 6.6L Duramax). This WCFab Transmission Cooler Thermostat Bypass Plug is a high-performance direct replacement for the failure-prone OEM thermostat found in GM 6L80, 6L90, and 8L90 transmissions.

By eliminating the restrictive factory thermal valve, this bypass plug allows for immediate and maximum fluid flow to the transmission cooler. In testing, this modification has shown fluid temperature drops of 15-50°F, protecting your transmission from the dangerous heat soak often experienced during heavy towing or in warm climate conditions. The CNC-machined billet aluminum construction ensures a precise fit and long-term durability compared to the stock plastic or cast components.

• Direct replacement for OEM part number: WCF100469
• Reduces fluid flow restriction to the transmission cooler
• CNC machined billet aluminum construction with a black anodized finish
• Equipped with high-temperature silicone O-ring seals for a leak-free fit
• Quick and easy installation; easily reversible for cold weather operation
• Recommended for both stock and built transmissions

Fits select 2006-2010 Chevrolet Silverado and GMC Sierra 2500 HD/3500 HD (6.6L LBZ/LMM Duramax). This Wehrli Custom Fabrication (WCFab) Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit replaces the restrictive factory upper radiator hose and coolant return pipe. By rerouting the coolant upward and forward from the thermostat, this kit clears the driver-side valve cover area to improve access to fuel system components and provide necessary clearance for larger aftermarket turbochargers.

• CNC Machined Billet Aluminum Thermostat Upper Housing
• Improves clearance for valley-mounted S300/S400 SXE and race cover style turbochargers
• Compatible with factory VGT style turbochargers
• Replaces GM Part Numbers 19330105, 15792824, 25833204, and 97361881
• WCFab Red custom powder coat finish
• Includes heavy-duty silicone boots and stainless steel T-bolt clamps
• Designed for single CP3 setups (MPN: WCF100420-RED)

Fits 2006-2010 Chevrolet Silverado and GMC Sierra 2500 HD / 3500 HD (6.6L Duramax LBZ/LMM).

This Wehrli Custom Fabrication (WCFab) Top Outlet Billet Thermostat Housing and Upper Coolant Pipe Kit is designed to optimize engine bay space and cooling efficiency on LBZ and LMM Duramax engines. By rerouting the coolant flow upward and forward from the thermostat, this kit eliminates the factory upper radiator hose that typically obstructs the driver-side valve cover and coolant return pipe. This revised layout is essential for mounting race cover style or BorgWarner SXE turbochargers in the valley, providing the necessary clearance for larger aftermarket setups and improved access to fuel system components.

The kit features a precision CNC-machined billet aluminum thermostat upper housing finished in a durable Gloss Black powder coat. It remains fully compatible with factory VGT style turbochargers and is configured for single CP3 pump setups.

• CNC Machined Billet Aluminum Thermostat Upper Housing
• Gloss Black Powder Coat Finish
• Includes Coolant Pipe, Silicone Boots, and T-Bolt Clamps
• Improves clearance for S400 and SXE frame turbochargers
• Replaces GM Part Numbers: 19330105, 15792824, 25833204, 97361881
• Manufacturer Part Number: WCF100420-GB

Fits select 1998-2018 Dodge and Ram 2500 and 3500 trucks (5.9L / 6.7L Cummins).

The WCFab x Fleece Performance Engineering Thermostat Housing is a precision-engineered upgrade designed to replace the unsightly factory cast coolant elbow on Cummins diesel engines. This housing serves as a direct bolt-on replacement for OEM part number 68145495AA, providing a cleaner look and enhanced functionality for your cooling system. Each unit features a built-in port with a removable plug, giving you the flexibility to customize coolant routing or install sensors for aftermarket monitors.

Manufactured in the USA, this housing is finished in a durable Bengal Red powder coat to perfectly complement other WCFab engine components like upper coolant pipes and intake kits. It is a robust solution for owners looking to improve both the reliability and aesthetics of their 1998-2018 5.9L or 6.7L engine bay.

• Direct replacement for OEM Part Number: 68145495AA
• Integrated NPT port with plug for custom coolant routing and auxiliary sensors
• High-quality Bengal Red powder-coated finish for corrosion resistance and style
• Specifically designed for 5.9L and 6.7L Cummins engines
• Made in the USA
• Manufacturer Part Number: WCF100157-BR

Note: 2007.5-2012 models may require additional hardware (Part # PE-CUMM-EBP-KIT-0712) for complete installation.

Fits select 2011-2025 Ford F-250 and F-350 Super Duty trucks (6.7L Power Stroke).

Replace the fragile factory plastic thermostat housing on your 6.7L Power Stroke with this high-strength cast aluminum upgrade from Fleece Performance. The original equipment plastic housing is a known failure point, frequently becoming brittle and cracking over time. These cracks lead to coolant leaks, low coolant levels, and potential engine overheating. This direct-replacement component provides a permanent solution, maintaining a reliable seal where the thermostat housing meets the coolant crossover manifold.

This housing is a drop-in upgrade designed to work seamlessly with all factory and aftermarket thermostats. The kit includes new O-rings to ensure a professional, leak-free installation. Whether you are addressing an active leak or performing preventative maintenance during a coolant flush, this aluminum housing eliminates the risk of plastic fatigue.

• Durable cast aluminum construction replaces OE plastic
• Direct drop-in replacement for a precise fit
• Compatible with factory and replacement thermostats
• Includes new O-rings for a complete seal
• Replaces Ford part number RH315 (LC3Z8592B) and Dorman 902-1074
• Manufacturer Part Number: FPE-FMC-TH-1125

Fits 1998-2018 Dodge and Ram 2500/3500 heavy-duty trucks equipped with the 5.9L or 6.7L Cummins turbo diesel engine.

The Fleece Performance replacement thermostat housing is a heavy-duty solution for owners looking to customize their cooling system. Featuring an integrated auxiliary port threaded for a -10AN (7/8"-14) fitting, this housing allows for precise coolant routing, making it an ideal choice for high-performance builds or those installing secondary cooling circuits. This component serves as a direct replacement for the thermostat elbow included in Fleece coolant bypass kits FPE-CLNTBYPS-CUMM-0712 and FPE-CLNTBYPS-CUMM-1318.

• Direct replacement for Cummins OE part numbers 5283433 and 3943297
• Auxiliary port threaded to accept -10AN (7/8"-14) fittings
• Includes FPE-SP-7814 port plug for use when auxiliary routing is not required
• Compatible with factory mounting points for a straightforward installation
• Manufacturer Part Number: FPE-CUMM-TH-1318