RX8 racing Beat Ram Air Duct. For Use with REV-I Intake Box. Racing Beat offers our Ram Air Duct for use with the Racing Beat REVi Intake Kit. The inlet of this duct is positioned in the mouth opening of the Mazda RX-8 to allow cooler ambient air to be force-fed directly into the REVi intake tract, converting your intake into a true “cold-air” intake system! Designed by Racing Beat, this high-density polyethylene intake duct mounts under the nose of your RX-8 and directs air into the inlet of the REVi Intake Kit. This duct can also be used with the stock intake box or aftermarket intake kits to direct cooler air into the engine compartment.