The '2018 V8 Mustang' is a custom car that Alfred Pennyworth bought for Bruce Wayne as a birthday present. The car has been specially modified for use in Wayne's vigilante activities.
History
The Mustang has been painted matte black and anti-reflective which makes it difficult to see at night. The car is also bulletproof as well.
The car also serves as a prototype version of the Batmobile which Bruce also uses for his identity as Batman in the comics.
Specifications
The Mustang used on the show is actually the 2018 Mustang GT Premium Fastback with a V8 5.0L 460 horsepower engine and all digital LCD cluster.
Trivia
Although assumed to be newly bought, the mustang can be seen to have had 7815.9 miliage already on the dash board in the scene when Bruce change the exhaust mode.