New CNC machined 6061 Billet. Thermostat housing for replacement of old corroded one, or putting a new fresh look. More corrosive resistant over stock cast. Can also be anodize to add more corrosion resistance for guys on track using water only option. Street use works great for that extra trick look, and the option of a fresh non corrosive housing . Will fit stock thermostat and bolt to stock head. 
Comes with 3 stainless Allen bolts.