Rear Diffuser 1970-78 (240Z / 260Z / 280Z)

This is a high quality custom rear diffuser for the Datsun 240Z, 260Z and 280Z. It is CNC cut from 1/8" aluminum, precision formed and TIG welded. It is designed to fit around the OEM fuel tank but will likely work will a fuel cell depending on size and location. The diffuser is open on the driver side to allow room for exhaust but also has that opening mirrored on the passenger side for those running a fuel cell and dual exhaust. Installation (though recommended to be done by a professional) is fast and easy and all of the needed hardware is included. In a matter of 30-90 minutes depending on the installer this diffuser leaves the back end looking clean but aggressive. It is available in raw (unfinished) aluminum or powder coated matte black and weighs only 14 lbs. The openings for the exhaust are 10" wide and 5" tall not including the cutout for the exhaust tip. *This design was made to work around factory components of the car as well as being affordable and easy to install. In doing this it may sacrifice some of the function of diffusers designed for track only cars. Diffusers are used in most racing venues and below is an excerpt from Wikipedia that describes the theory behind a diffuser. From Wikipedia: When a diffuser is used, the air flows into the underbody from the front and sides of the car, accelerates and reduces pressure. There is a suction peak at the transition of the flat bottom and diffuser. The diffuser then eases this high velocity air back to normal velocity and also helps fill in the area behind the car making the whole underbody a more efficient downforce producing device by reducing drag on the car and increasing downforce.