These oil cooler plenums give you better airflow into your oil cooler than a sheet metal box that is commonly used. They are made from high temp 3D printed plastic with a flange that accepts 3in SCAT tubing. They have been proven to work with over 250hrs run time on them so far. I have models to fit Aero Classics oil coolers P/N 8000074, 8001201, and 8001599. These are commonly used on the Lycoming 0-320 or 0-360 engines. If you have a different oil cooler you need one for please, contact me and I can design one for your application. Lead times are typically 3 weeks.