After several difficulties including the cancellation of a planned test in Portugal when Bridgestone refused to supply tyres, Stefan attempted to purchase the defunct USF1 entry, but the moves were blocked.
Nakon nekoliko poteškoća, uključujući i otkazivanje predviđenih testiranja u Portugalu kada je Bridgestone odbio snabdijevanje gumama, Stefan je nastojao steći neiskorištenu prijavu momčadi USF1, ali to je bilo spriječeno.