In 2007 Münter became the fourth woman in history to compete in the Indy Pro Series, the development league of IndyCar. In May, Münter passed her Indy Pro Series rookie test at Kentucky Speedway. In August she signed a deal with three-time championship team Sam Schmidt Motorsports. She qualified fifth for her debut at Kentucky Speedway on August 11. She had trouble on a restart and dropped to thirteenth but raced her way back to the front of the field. She passed five cars in a lap and a half and turned in the fifth-fastest lap of the race with a speed of 192.399 mph. She was about to pass for fourth place when she was involved in a multi-car accident. Four-time Indy 500 champion Rick Mears, IndyCar driver Jaques Lazier, and many others in the IndyCar community spoke highly of Münter after her debut.