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The WCFab thermostat housing for 2017–2025 6.6L L5P Duramax is a direct replacement that improves engine bay appearance and pairs with WCFab intake and coolant components. Powder-coated in Bengal Grey, it installs in place of the OEM housing and keeps original coolant flow while offering a finished look that complements other WCFab pieces. A simple swap to tidy the engine bay.
Wehrli L5P Duramax Thermostat Housing - Bengal Grey
