2010 Ford Mustang Shelby GT500 dyno tested, lives up to it's 540hp rating

It's no surprise that the new GT500 is fast, but it's also no surprise that someone was going to throw the thing on a dyno to confirm rated horsepower. It's a practice that's been going on for many many years, back to when manufacturers underrated power numbers to keep insurance cheap for car buyers.

And some things never change. 5.0 Mustang & Super Fords strapped a 2010 Shelby GT500down and the results were better than expected. The Mustang belted out a stout 478.53 horsepower and 470.43 lb-ft torque at the rear wheels on a hot and muggy day in Florida. The traditional calculation of allowing a 15% loss of power through the drivetrain puts flywheel horsepower at over 560hp.