Its here once again! Forza Motorsport has announced the September track pack for Forza 4 and now they have added the racing variants of the 2013 SRT Viper GTS-R (The stock car was added back in June). Both the #91 and #93 Viper GTS-R race cars are added to shred virtual rubber on virtual circuits.


The #91 Viper is sponsored by Forza Motorsport and competes in the 2012 American Le Mans Series. But that's not all. On top of the vipers, there is a whole list of other cars from the 1968 Alfa Romeo 33 Stradale, to a 2011 Citroën DS4.

Here are the other cars in the pack:

1953 Chevrolet Corvette1955 Mercedes-Benz 300 SLR
2011 Citroën DS4

• 1968 Alfa Romeo 33 Stradale
• 1960 Aston Martin DB4 GT Zagato
• 1958 Austin-Healey Sprite MKI
• 1965 MG MGB GT
• 1967 Volkswagen Karmann Ghia
• 1983 GMC Vandura G-1500