Ever since the end of the factory Dodge Viper racing program, the American Le Mans Series GT1 class has been dominated by the factory C5R and C6R Corvettes. For a while they were challenged by assorted Panoz GTR1s, privateer Vipers, Ferrari 575s and Aston Martins. In 2007, aside from an Aston Martin at Sebring, the 'Vettes have had the GT1 class to themselves.
Without some serious challengers there really isn't any point in GM continuing to fund the program. Program Manager Doug Fehan has said that they would only run unopposed for one year. If Aston Martin, Ferrari or someone else doesn't step up to the plate, 2007 is likely to be the last year for the factory C6R GT1 program. The team will definitely run at Le Mans next year but anything else is unclear right now. Beyond 2008 the team could switch to GT2 where they might challenge all the 911s and F430s.