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In addition to Porsche street cars, several notable Porsche Motorsport customer racecars are also offered as part of the Porsche Expansion Pack -- cars which compete in the American Le Mans Series (ALMS) GT and GTC classes. The Porsche Expansion Pack will be offered for download through Xbox LIVE by customers who own the Forza Motorsport 4 game for 1600 Microsoft Points or, the equivalent of about $19.99.