The CS850R Mustang is a track-bred muscle car with 847 horsepower | Modified Rides

The CS850R Mustang is a track-bred muscle car with 847 horsepower | Modified Rides: The fastest new Mustang on the market is now even faster. Clive Sutton has announced the updated version of its upgraded Ford Mustang (dubbed the CS850GT) in the UK, which is based on the upgraded Mustang in the US (the Shelby GT500).