In 2003 Taylor moved to the American Infiniti Pro Series. He dominated the field, winning 7 of the 12 races in the season driving the #4 car for the Fulmar Panther team. He graduated to the IndyCar Series driving the #2 for Team Menard in 2004. However, while showing good speed, particularly in qualifying, he struggled to adapt to the top series. He was involved in accidents in five of his six starts (including the Indy 500) before he was dropped in favor of Townsend Bell.