Planes, the Red Arrows I think.356CThe only thing special to endurance races that I've seen, is the red white and blue smoke trail from a plane or planes (can't tell) at the beginning of the Le Mans 24h race. Maybe GT5?
G.TI thought it was the red arrows because I went to an airshow last year, and the same blue, white and red smoke was launched from them, and they look pretty similair too.