Williams introduced numerous changes for 2006, particularly changing to Cosworth V8 engines after they and BMW split. Red Bull Racing (RBR) had Ferrari engines, replacing the Cosworth power which gained them seventh in the standings in 2005. Williams and Toyota changed tyre suppliers to Bridgestone, due to Michelin's desire to supply fewer teams in the championship. Despite this Toro Rosso who under the Minardi name ran Bridgestone tyres switched to Michelin in line with parent team RBR.