The "Furai" was Mazda's concept car shown at the 2008 Detroit Motor Show. It is the 5th design in the "Nagare" design concept series, and the word Furai, means "the sound of the wind". It was manufactured based on the Courage C65 chassis used by Mazda in the ALMS P2 racing class, and was mounted with a 3 rotor R20B rotary engine producing 444 BHP. As an environmentally friendly super performance machine, it is fuelled by BP's ethanol fuel, E100. The use of the 100% ethanol fuel in the rotary engine opens new doors for the possibilities of rotary engines in the future.