The "NASCAR Busch Series" is the second-highest level of professional competition in NASCAR. The cars look very similar to Nextel Cup cars with only a few differences, such as the weight and length of the car, the size of the rear spoiler, and the power output of the engine. As of 2007, the defending champion is Kevin Harvick.

The Busch Series is currently the only series of the top three to race outside the United States and the only series to have ever held points-paying international events. The season is a few races shorter and the prize money is significantly lower. Over the last several years, a number of NEXTEL Cup drivers have tried to run races in both series, using the Busch race as a warm-up to the Cup event at the same facility. Detractors of this practice have labeled such drivers as "Busch-whackers." The Busch sponsorship is set to expire at the end of 2007 and the series is currently looking for a new title sponsor for 2008 and beyond.

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