The Dodge Challenger is a muscle car and that means one thing: it has muscle! Proof positive is the SRT Hellcat version that features a 6.2-litre V8 producing a whopping 707 horsepower. Besides the 6-speed manual gearbox, there's an optional 8-speed automatic. Some other versions rely on a 305-horsepower V6, while other models are powered by a 5.7-litre V8 Hemi.