The 2010 Mustang in turn looks much like the 2005-09 model, but all the body parts except for the roof are different. The rear turn signals of the 2005-2010 cars blink in a one-two-three sequence like the 1967-68 Mercury Cougar and 1964-66 Ford Thunderbird. Power for the V8 rose to 315 hp. In 2011, the Mustang received new engines, a 3.7-liter V6 base engine with 305 hp and a new 5.0-liter engine with 412 hp. Power on the Shelby GT500 rose to 550 hp and later to 662 hp in 2013. A Boss 302 performance version powered by a 444 hp V8 was introduced for 2012.