A stock-looking late-model Mustang that pushes 1,420 horsepower and still gets driven on coffee runs sounds like a tall tale, but this Hellion Turbo build makes it real. Driven by the company owner’s wife, it runs sub-nine-second quarter miles while staying fully streetable, with no trailer required. Read on to see how a twin-turbo system can hide that much power in plain sight, and why the streetable half of the equation is the hard part.