The 2006 Toro Rosso chassis was a modified version of the 2005 Red Bull Racing RB1. Some teams felt that this infringed the rule that each team must design their own car. Toro Rosso claim that this design was first produced during by Jaguar Racing, Red Bull's predecessor. They believed that the design rights had belonged to the Ford Motor Company, Jaguar Racing's parent company before passing to Toro Rosso.