Please be advised that is available on the Marketplace ( web link ) the new DLC for Forza Motorsport 4 titled "bonus Package of 2013 SRT Viper GTS" which will allow you to download the entire American supercar SRT Viper GTS of 2013. The expansion includes the ability to explore in any detail the car in Autovista mode, but to use the fireball in career mode will serve you in-game credits or chips.