2021 Ford Mustang Mach 1 first drive review: Bullitt with butterfly wings Sharper than a Bullitt but less aggressive than a GT350, does the Mach 1 bridge the gap between Mustang GT and Shelby, or is it simply stuck in the middle? Listen - 06:08 This gray color is exclusive to the Mach 1's appearance package. Steven Ewing/Roadshow The Mach 1 aims to bridge the gap between GT and Shelby in the Ford Mustang hierarchy and essentially picks up where the Bullitt left off. Its 5.0-liter V8 has the Bullitt's 480-horsepower tune and with a few powertrain and suspension upgrades from the Shelby GT350 (RIP), it makes for a rootin'-tootin' Mustang that's easy to like.