High Quality Content by WIKIPEDIA articles! The 2005 American Le Mans Series season was the 7th season for the IMSA American Le Mans Series. It was a series for Le Mans Prototypes (LMP) and Grand Touring (GT) race cars divided into 4 classes: LMP1, LMP2, GT1, and GT2. It began March 19, 2005 and ended October 16, 2005 after 10 races.