constructors entered free practice only drivers over the course of the season. Team changes Three prominent names in the sport disappeared for this season, with Minardi, BAR and Jordan changing names under new ownership, while Sauber changed ownership, and one new team, Super Aguri, entered at the last moment. Minardi were taken over by Red Bull, becoming Toro Rosso, which is Italian for Red Bull. The Sauber name remained, although largely as a sentiment, as BMW had purchased 80% of the team, with Peter Sauber keeping only a 20% share. A year after Alex Shnaider had purchased the team and following a disappointing final season under the Jordan name, Jordan was renamed to MF1 Racing after Shnaider's Midland Group company. Late in the season, the team was bought by Spyker. Honda, who already owned a 45% stake in the BAR team, completed their takeover of the team and changed its name to Honda Racing F1 Team at the start of the season. Super Aguri F1 also entered their first season after having problems entering. They received backing from Honda including technology and engines, due to them running Honda factory driver Takuma Sato. 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 . 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. Driver changes Ferrari replaced Michael Schumacher's longtime teammate Rubens Barrichello with fellow Brazilian Felipe Massa, who moved from Sauber. Massa had previously tested with Ferrari in 2003. Massa was replaced at the newly renamed BMW Sauber team by Nick Heidfeld, who had driven for BMW's previous partners Williams for much of 2005. Poland's Robert Kubica took up the third driver's role at BMW Sauber. Barrichello moved to Honda, where he replaced the outgoing Takuma Sato. The Honda-backed Super Aguri team started the season with Sato and Yuji Ide, an all-Japanese driver line up. Franck Montagny moved from his Renault testing role to become Super Aguri's third driver. His position at Renault was taken by the GP2 runner-up Heikki Kovalainen. Williams promoted test driver Nico Rosberg, who had won the inaugural GP2