American tuning firm Hennessey has crafted some pretty insane vehicles over the years. One of its most recent tunes is based on the Cadillac CTS-V Sport Wagon, which leaves GM?s factory with a 556-horsepower 6.2-liter V8 lump, but once Hennessey?s engineers perform their magic under the hood, output is lifted to 650 horsepower. To show off the[...]

Source: Carscoop Tuning