Mach 1 Mule
The Mustang 5.0 pictured includes a quad exhaust setup, as seen on the GT350, and with a beefier rear axle.
’17 Silverado 3500 HD
This is the Chevy Silverado HD, featuring the latest Duramax diesel engine, conducting cold-weather testing.
Ram HD Truck
Spotted among various Chrysler prototypes is a heavily modified Ram HD with a cobbled-together front end.
’17 Camaro ZL1
This is the ’17 Chevy Camaro ZL1, caught while track testing in Milford, Michigan.