Hennessey Performance Engineering boss John Hennessey is a big fan of the Chevrolet SS.

In fact he has a 2014 example in his personal collection.

And his company has a series of upgrades for the sleeper sedan that lifts output well beyond the stock 415 horsepower.

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The most potent are grouped in a package known as the HPE650. The package adds a supercharger, among other things, and sees the car develop a claimed 650 horsepower from the 6.2-liter V-8 found under the hood. Such an output should see the 0-60 mph time drop down to about 4.0 seconds, or about a half a second quicker than stock.

Hennessey recently strapped an HPE650-enhanced SS to the dyno to verify its performance. A quick look at the results shows the car is now delivering a peak output of 565 horsepower and 490 pound-feet of torque. These figures are calculated at the wheels, so assuming a typical 15 percent the car’s output is right within Hennessey’s claims.

This particular SS is the latest 2016 model, which received some visual tweaks as well as a throatier exhaust system, the latter of which you'll definitely notice in the video.

Sadly, the SS may be discontinued in the not too distant future. As many readers will know, the SS is a rebadged version of a Holden sold in Australia. With Holden set to end production late next year, it means there won’t be any new SS sedans being built after that date.


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