Circuit Werks latest SR20DET swap Nissan 240SX / Silvia Turbo Outlet. Will fit all 1989-1998 Nissan 240SX with a SR20DET Rear Wheel swap stock or any aftermarket turbos with 5 bolt flange. Comes with a Turbo 5 bolt gasket and 3 bolt gasket along with hardware. The o2 bung is for the standard "fat" sensor which is 18mm x 1.5 thread pitch. If you have any technical questions feel free to ask us and we'll do our best to answer them in a very timely manner.