Münter started racing cars in 2001 and has spent the last ten years working her way up the NASCAR ranks. During this time she also worked as a race instructor and spent three years as a special correspondent for NASCAR.com. In 2003 she had her first start in the NASCAR Weekly Racing Series at South Boston Speedway—she finished ninth. She made her first speedway start in 2004 at Texas Motor Speedway and set a new record when she qualified fourth, the highest qualifying effort for a female driver at the track.
Münter returned to Texas Motor Speedway in 2006 and set a new record when she finished 4th, the highest finish for a female driver in the history of the 1.5 mile speedway. Later that year, she became the first woman to qualify in the 45 year history of the Bettenhausen Classic at Illiana Speedway in Indiana.
In 2008, as an Ambassador of the National Wildlife Federation, Leilani became politically active in the legislative fight for the environment. She made several trips to Capitol Hill to speak with Congress on behalf of climate issues with climate change scientists from the National Wildlife Federation.
Later that year, she became involved in the fight against the dolphin slaughter in Taiji, Japan and became a volunteer for Save Japan Dolphins. In September, Münter stood in Tokyo, next to dolphin activist Ric O'Barry who is featured in the movie, to deliver a petition signed by 1.7 million people from 151 countries asking for the dolphin slaughter to end.
Münter's accomplishments have landed her on the pages of USA Today, the New York Times, Italian Vogue, Esquire, ESPN Magazine, Men's Journal, Newsweek, Glamour, Reader's Digest, Vanity Fair, and Washington Post, with Sports Illustrated naming her one of the top ten female race car drivers in the world. In 2010 Discovery's Planet Green named her the #1 Eco Athlete, beating out Lance Armstrong for the top spot.
Münter is also an accomplished writer, currently contributing to Discovery's Treehugger.com and the green section of The Huffington Post, rated the most influential blog in the world by the Guardian and topping TIME magazine's blog index.