The Mustang RTR is Vaughn Gittin Jr.’s production interpretation of the car he drifts for a living, and its tiers differ by considerably more than badges. The 472-horsepower figure attached to the GT comes from Ford Performance hardware rather than a third-party tuner, which is precisely why the factory warranty survives the upgrade intact. Read on for what separates Spec 1 from Spec 2, and why the suspension work may matter more than the power does.