Viper GTS Hits the Dyno

640 horsepower is a lot of muscle, any way you cut it. But how much power does the 2013 SRT Viper GTS put down to the ground? Edmunds finds out.

The Viper stands as one of the most powerful vehicles ever made in America. As well it should be, with ten cylinders running at full capacity. And despite constricting regulations, the new SRT model is the most powerful version yet. In GTS trim, the 2013 SRT Viper's 8.4-liter V10 produces 640 horsepower, marking a significant improvement over the original 1992 Dodge Viper's 400 horsepower output. That manufacturer's claim is all well and good, but how many of those horses does the Viper actually put down the road?

To find out, Edmunds took the new Viper GTS to the dyno, strapped it in and nailed the throttle. Check out the results in the video below.

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