Ford Mustang GTR Concept Screensaver - Version 1 Ford Mustang GTR Concept Screensaver. The GT-R concept was hint at Ford coming back to racing again. [7] Its 5.0 "Cammer" V8 engine with 440 ponies under the hood makes for a very impressive Mustang. Its Valencia Orange color, inspired by Grabber Orange 1970 Mustang Boss 302 Trans-Am race cars, and wider body. Along with GT-R wheels, Brembo brakes, Pirelli slicks and aggressive wing. Not to mention aggressive front, rear and side facias, even aggressive headlights to make this one mean mustang. Many to date wish there was a production model for just such a iconic Ford vehicle.