Hennessey is comparing their 850 HP Mustang upgrade to a stock 2017 Dodge Viper, but honestly, we'd prefer the Viper.

Here, an 850-horsepower Hennessey-tuned Mustang GT350R is challenged by a fifth-generation Dodge Viper.

Although the last Dodge Viper left the factory over two years ago, its reputation continues to this day. 

One of the largest naturally aspirated engines ever installed within an engine compartment is an 8.4-L V10, and the sound it creates has become recognisable. 

The Viper can accelerate from 0 to 60 miles per hour in less than 3.5 seconds thanks to a 6-speed manual transmission, 

which also manages to channel all 650 horsepower to the rear wheels.

A Shelby Mustang GT350R will be its adversary for the day, but this is no ordinary Mustang. 

With a 2.9-L supercharger added to its 5.2-L Voodoo V8, it has been upgraded by Hennessey Performance to generate 858 horsepower. 

The Mustang is able to generate such stratospheric power and accelerate from 0 to 60 mph in only 3.3 seconds 

thanks to a redesigned throttle body, high-flow fuel injectors, and a new cooling system.

Hennessey chose to hold an impromptu performance test by competing these two vehicles in a rolling race since they are quite evenly matched. 

A rolling race is preferable to a traditional drag race since getting either car to hook up on an unprepared surface would only result in a bunch of smoke and screeching tyres.

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