The IMSA Continental Tire SportsCar Challenge (CTSC) is a touring car series run by the International Motor Sports Association (IMSA). Originating from the Canadian Motorola Cup, the series was taken over by Grand-Am in 2001 to become the Grand-Am Cup. KONI came on as title sponsor in 2007, so the series became the KONI Challenge Series, renamed as the KONI Sports Car Challenge in 2009. The series then adopted its current name and title sponsor for the 2010 season.
With races that are 2.5 hours long and require a driver change, CTSC is typically run as a support series at IMSA WeatherTech SportsCar Championship events in the US and Canada, and consists of two production-based vehicle classes:
Multimatic Motorsports, under the leadership of Sean Mason, competes in the GS class with one car for 2016:
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