High Quality Content by WIKIPEDIA articles! The 2004 Le Mans Endurance Series season was the first season of ACO`s Le Mans Endurance Series. It is a series for Le Mans prototype and Grand Touring style cars broken into 4 classes: LMP1, LMP2, GTS, and GT. It began on May 9, 2004 and ended on November 13, 2004 after 4 rounds.