Blow away your competition with this explosive car pack, featuring eight unique boss cars available for use in any online race or offline career event. Race your way to the top of the leaderboards with each of these cars: Carmen's Shelby GT500, Chase’s BMW M6, Chau Wu’s Mercedes-Benz CLS 63 AMG, G-Mac’s Lamborghini Gallardo LP560-4 , Hector’s Nissan 370Z (Z34), Nickel’s Dodge Viper SRT10, Rose’s Porsche 911 GT2 and Zack’s Volkswagen Scirocco. Find out more at needforspeed.com. NOTE: The free Challenge Series Upgrade is required (separate download) in order for these cars to be used. There are no refunds for this item. For more information, see www.xbox.com/live/accounts.