Well, 2015 S550 Mustang and its independend rear suspension isn’t that big new deal to Mustang, ’cause all 1999-2004 Cobras featured independent rear suspension, unique to the Cobras. The Mustang SVT cobra was the first and only mustang to ever have a independent suspension rather than a live axle. Which made it an amazing handling muscle car. The SVT cobra is still sought after today because of how rare it is and it’s performance.