10:06 AM ET 06.26 | Brian Vickers is an admitted thrill-seeker. He recently parachuted into Daytona International Speedway. He's water-skied the Panama Canal. He did a trapeze act in New York City last Monday. Now he's wondering what will happen with his Sprint Cup career following the announcement last week that Red Bull will withdraw from NASCAR racing at the end of the season. The news rumbled through the sport in advance of today's Toyota Save Mart 350 at Infineon Raceway. It means the loss of a high-profile, high-dollar sponsorship and it leaves two race teams - Vickers' team and Kasey Kahne's - with an uncertain future. "I'd be lying if I didn't think it was on my mind," Vickers said. "This has kind of been on the table for a while now. It's something they've kicked around on an annual basis. Do they want to be an owner in the sport?"