The Chevrolet SS isn't selling in huge numbers, but it's one hell of a sleeper. Underneath its subdued styling, it packs rear-wheel drive, a magnetic suspension, an available manual transmission, and a 6.2-liter LS3 V8. But what if instead of just a naturally-aspirated 415-horsepower LS3, you could get your SS with the supercharged 6.2-liter LSA that made 580 horses in the last-gen Camaro ZL1?

It's still unsubstantiated, but that's the rumor coming from GM Authority this week. 2017 is the last year for both the SS and the Australian-market Holden Commodore it's based on. To send it off in style, the supercharged LSA might find its way under the sport sedan's hood, says an anonymous insider—the same engine that powered the 2012-2015 Camaro ZL1 and the 556-horse Cadillac CTS-V from 2008-2015.

If this rumor turns out to be true, that could mean close to 600 horses hiding under the hood of a sports sedan some folks might confuse for a Malibu.

Now that's what we call a sleeper.

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