the 2005 model was the first all-new mustang since 1979. because the original mustang was and is one of the most popular cars ever, ford made the new mustang coupe and convertible look very much like the first mustangs, especially the 1967 and 1968 models. the engines of the 2005 mustang were based on the older engines, but had more power. the 4.0-liter v6 engine made 210 hp and the 4.6-liter v8 300 hp, which rose to 315 hp on the 2008 bullitt. all models were available with manual and automatic transmissions.