The Forza Motorsport series for Xbox 360 has always been popular amongst gamers and motor enthusiasts alike, in part because of its simulation-style racing, but also as a result of the large catalogue of cars that it offers.

Forza Horizon is the latest entry in the franchise to hit store shelves and now a pack of new cars is being made available for those who own it, including a couple of all-American classics.

The first is a 1971 AMC Javelin AMX, which at the time of its launch, was seen as a real powerhouse, boasting 330bhp under the hood and the ability to cover a quarter mile in a hair over 14 seconds.

The second is a 2006 Ford GT X1, which is based on the real life car, designed to evoke the heritage of its 1966 GTX equivalent.

The modern Ford GT became a classic almost as soon as it launched and this specialised version has 700bhp and a 5.4 liter V8 engine, with a supercharger bolted on to boost its performance further.

Also in the pack is the 1993 McLaren F1 supercar, which is often seen as one of the best cars ever built.