The 2017 Shelby GT350’s 5.2-liter Voodoo V8 used a flat-plane crankshaft, revved to 8,250 rpm, and made 526 horsepower without a turbo or a supercharger anywhere in sight. It was hand-assembled by two-person teams on a dedicated line, sounded more like a Ferrari than a Mustang, and lasted five model years before Ford moved on. Owners still treat surviving examples as a limited-run specialty engine rather than an ordinary Mustang V8. Read on for why.