This is on-board footage from the 1991 Mazda RX-7 IMSA GTO race car as it laps Laguna Seca during this year’s Rolex Monterey Motorsports Reunion. Mazda won the 1991 season with this car. The GTO class of IMSA racing was for engines above 3 liters in tube frame cars that had production car silhouettes. Motivation for this car comes from a 26b 4-rotor engine that makes 600 hp at 8500 rpm and 390 ft-lbs of torque at 7000 rpm putting power down through a Hewland 5-speed transmission. You can see two of the three other 4-rotor cars that Mazda had at the event racing on track with this RX-7.
Source: Road and Track on YouTube and Mazda USA