Ford Limited Edition 840HP Mustang GT500

While the 2015 Challenger and Charger Hellcat models remain the most powerful muscle cars ever, Ford offers up a limited edition version of the 2014 Shelby GT500 with nearly 150 more horsepower.

Dubbed the “Super Snake”, it features a “greatest hits” list of Shelby’s most popular upgrades, pushing its horsepower output to an impressive 850.

According to Yahoo Autos, a buyer must already own a standard 2007-2014 GT500 coupe or convertible, which Shelby when then give a thorough performance upgrade — including a new 3.6-liter Kenne Bell supercharger, an upgraded Shelby Performance radiator, heat exchanger, and aluminum cooling tanks.

This offer is limited to just 50 models and only until January 31st.