For their initial season in 2005, one B05/40 would be used by Intersport Racing in the American Le Mans Series season, while Chamberlain-Synergy Motorsport, Lista Racing, Ray Mallock Ltd. and Binnie Motorsports competed in the Le Mans Endurance Series. In the ALMS, Intersport would easily take the LMP2 championship with five victories over the season. Meanwhile, in the LMES, Chamberlain-Synergy would take the LMP2 championship, while Ray Mallock would take second and Horag fourth, with each of the three teams managing one win over the season. In the middle of the season, at the 24 Hours of Le Mans, Intersport would join Ray Mallock and Chamberlain-Synergy for the endurance event, with Ray Mallock taking the LMP2 victory.