Kahne's open-wheel cars carry the No. 4.
Kahne drove the No. 9 car for Richard Petty Motorsports for all but the final five races of the Cup season before moving over to the No. 83 Red Bull Toyota. Brian Vickers, who missed most of the 2010 season with blood clots, is expected to return to the No. 83. Speed was released by Red Bull earlier this month. NASCAR.com