Photo Credit: Jeffery Balliet It’s been a busy year so far for the winners of the opening event in the 2015 Optima Batteries’ Ultimate Street Car Series. Rob Krider and Keith Kramer, successful endurance racing drivers since 2008, drove Krider’s 2006 Corvette Z06 to the top spot in the Feb. 28/March 1 competition at Thunderhill [...]

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