Mitsubishi Evolution Evo 4-9 4G63 3.5” Cast Outlet O2 Housing Dump PipeHighest flow on the market. Cast Stainless Construction. Dual threaded O2 Sensor bungs. V Band style outlet to front pipe. Package comes with dump pipe and v band flange. Does not include v band clamp. One rule with ARTEC is that we dont just follow the pack. This is shown again with our EVO Dump pipe, Cast Outlet, or 02 Housing, (Different countries have different names for them). Virtually all the companies in the market (except for the new Tomei