This is our direct bolt on swirl pot for all SR20 motors. This helps to aid in making your cooling system the most effective as possible by acting as a constant air bleed. There is an option to add a 6an fitting to use as a water outlet for your water cooled turbo. If your turbo is not water cooled, this port can easily be capped off. All units come standard with stainless hardware. Titanium hardware is an upgrade option in the drop down menu.