Shelby American is ready to sharpen theeven more. Last Friday, the company announced the Shelby GT500 Signature Edition, and it packs over 800 horsepower.
We don’t have a final horsepower figure yet, but at least 40 extra hp comes from a new pulley and coolers for the supercharged 5.2-liter V8 engine. Engineers also slimmed the car down by 30 pounds, thanks to lightweight elements such as a carbon-fiber hood. In addition, there’s a new set of track-focused springs and a