KONI Challenge Series

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The KONI Challenge Series (formerly known as Grand-Am Cup) is a touring car series run by the Grand American Road Racing Association. Originating from the Canadian Motorola Cup, the series was taken over by Grand-Am in 2001 to become the Grand-Am Cup. KONI became series sponsor for the start of the 2007 season.

The series rules have been altered over the years, but currently two are used: Grand Sport (GS) for large 6-cylinder or 8-cylinder rear-wheel drive sports cars and Street Tuner (ST) for smaller 4-cylinder or 6-cylinder rear or front-wheel drive compact sedans, coupes, or convertibles. Both classes may run in the same race, or it is a "split race".

The series is a popular support race for the larger Rolex Sports Car Series, also run by Grand-Am.

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