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The 2004 American Le Mans Series season was the 34th season for the IMSA GT Championship, and the sixth under the American Le Mans Series banner. It was a series for Le Mans Prototypes (LMP) and Grand Touring (GT) race cars divided into 4 classes: LMP1, LMP2, GTS, and GT. It began March 20, 2004 and ended October 16, 2004 after 9 races.