Monteiro gave the B spec chassis its debut in Italy whilst Karthikeyan still had the previous model.

For the following race in Belgium, both drivers used EJ15Bs, and they would both see out the remainder of the season with the new chassis, with Monteiro's 8th place at Spa its best result.

[10] Following the end of the 2005 season, the EJ15B chassis was used in winter testing at Jerez in December 2005 by a variety of drivers including Roman Rusinov, Jeffrey van Hooydonk and Monteiro.

At the United States Grand Prix, Benson & Hedges was replaced with Sobranie due to the Tobacco Master Settlement Agreement.

At the Canadian Grand Prix, the "Bring Back Hockey" slogan featured on the airbox as a reaction to the 2004-05 NHL lockout.