Sound & Fury Here’s the first video of the forthcoming GT500 test mule in action By Steve Turner Photos by KGP Photography Last week dedicated spy photographers captured out-of-captivity shots of a 2018 Shelby GT500 prototype roaming the streets of Dearborn, Michigan. With so much anticipation about what powertrain is lurking underneath this Ford Performance machine, the spies kept after it and finally captured video of the car in action for the world to analyze and theorize about what the sound of this car means. While the popular theory—or at least everyone’s dream—is that the car will be powered by an EcoBoost V-8. However, in listening to the clip of this car, we have to say the exhaust note sounds pretty robust for a turbocharged machine, as turbos act like mufflers. Plus we don’t here any hits of blow-off valves or other turbo sounds. To judge for yourself, check out this brief clip… [video=youtube;1Ltilz7vdgw]https://www.youtube.com/watch?v=1Ltilz7vdgw[/video] The photographers seem to believe this one sounded like another Voodoo variant in person, but the drivers were clearly taking it easy when the cameras are pointed at the car. Could it be that this is another naturally aspirated Mustang in development or could it be that there’s a supercharged, cross-plane 5.2-liter V-8 underhood? We don’t know yet, but it sure will be fun to find out. What we can see for sure is that this car sports a GT350 R wing, and it seems to have larger openings in the front fascia for cooling, which leads to speculation about an intercooler of some type hidden behind the bulky bra. What do you think Ford engineers are developing with this test car? Spy photographers recently captured video footage of what is believed to be the development mule for the forthcoming Shelby GT500, which is rumored to produce 750 to 800 horsepower.