Mass air flow flange adapter for 4.00” (102mm) OD Flange designed to match the factory shape of the sensor with precision radius to perfectly fit the OD of the tube. *Sensor NOT included. Reuse factory sensor.* --- CNC machined from 6061 billet aluminum --- Stainless steel hardware --- Hand inspected for consistent quality --- Suitable for welding, powder coating, anodizing or polishing --- Made in USA --- --- Personalize your build with an MRP component and make your custom project stand out from the crowd. A product of Performance MRP.