Upgrade your cooling system with the Ichiban Engineering Billet Thermostat Housing, engineered for Mitsubishi Evo 6–9. Precision-machined from 6061 aircraft-grade billet aluminum, this housing offers superior durability, precision fitment, and a sleek motorsport finish—making it the ultimate replacement for the factory cast piece.
 
Designed after the Evo 9 housing, it includes the coolant recirculation port while maintaining full compatibility with Evo 6, 7, and 8 models. For added functionality, we’ve replaced the OEM barb turbo coolant fitting with an AN6 port, allowing easy integration with modern braided lines and fittings. The housing also retains the OEM M14 coolant temperature sensor port for seamless integration with factory electronics.
 
To ensure leak-free operation, our design uses a high-quality Viton O-ring (included in the kit) that seals directly against the engine—eliminating the need for messy RTV silicone. Multiple anodized color options are available from the menu above, letting you personalize your engine bay with both performance and style.
 
Whether you’re building a street Evo or a track-focused monster, the Ichiban Engineering Billet Thermostat Housing is a must-have upgrade for reliability, functionality, and aesthetics.

Please Note - Upper Water Neck is not included. If you need the Water neck as well, we offer it in a different listing.