The GSX-R/4 is a concept car made by Suzuki in 2001. It had a mid-mounted, 1.3 liter DOHC engine taken from the company's superbike, the GSX-R 1300 Hayabusa. Designed as a showcase for technology, the GSX-R/4 was never meant for production. It had upscale features such as GPS navigation.
The GSX-R/4 is featured in Polyphony Digital's game, Gran Turismo 4.