Dodge Viper ACR The 2016 Dodge Viper ACR is a super-fast car you can legally drive on the street, which is unusual for a car this powerful. But even though it's street-legal, the ACR can be fine-tuned for the racetrack in ways most cars can't. This fine-tuning is done with special parts you can add or remove. Imagine it like building with Legos for grown-ups! This makes it clear how this Viper is all about speed and handling. It has a massive 8.4-liter V10 engine pumping out 645 horsepower, making it one of the most powerful Vipers ever built. As we were talking about the special parts fine-tuning, here are the parts that you can add -- A bigger splitter in the front to push the car down onto the ground.- A giant adjustable wing on the back for even more downforce.- Special fins and air deflectors to control how air flows around the car.- Vents that open and close to control air pressure in the wheels. Inside, the Viper ACR is finished in a sporty finish for lightweight performance with a faux-suede interior, completed with a special "ACR" badge, a unique performance steering wheel, and lightweight carpets. While a 3-speaker sound system keeps things simple (though not as minimal as some rivals), the surprisingly well-made cabin retains features like a navigation system and even trunk carpeting, offering unexpected comfort for a track-focused beast.