There aren’t that many cars in the world that are as at home in a dyno as the Ford Mustang. That’s why it’s a treat to present you this: a 2015 Mustang GT California Special getting put through the paces in an incredible dyno run. Since this is the California Special we’re talking about, it comes with its usual array of exterior and interior modifications that aren’t found on a regular Mustang. More importantly, this Mustang also received an extensive engine upgrade, none more important than the installation of a 2.9L Whipple Supercharger. The result is an absolutely sinister 666 horsepower on tap, enough to make even the devil hide in fear.