(10 photos of a 2010 Sterling Gray Mustang Shelby GT-500 Convertible) This is a Sterling Gray metallic 2010 Mustang Shelby GT-500 convertible. Sterling Gray is a new color for 2010. Other new features of the 2010 Shelby GT-500 include: new front and rear fascias, larger lower front grille, new newly designed grille Cobra emblem moved from the driver's left side to the right, new hood power dome with functional heat extractors, new wider side stripes, Easy Fill capless fuel filler, new 18 inch machined cast aluminum wheels on the convertible, and P255/45 ZR18 front P285/40 ZR18 rear Goodyear Eagle F1 supercar tires. Interior changes and new options follow the 2010 Mustang. The brakes are power 4-wheel discs with ABS (Brembo front rotors and calipers). The brakes are power 4-wheel discs with ABS (Brembo front rotors and calipers). The engine a 540hp 5.4L Supercharged 4V V8 from the 2009 GT500KR . Power is sent to an improved Tremec Twin-disc clutch 6-speed manual transmission.