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Ryan VargasNASCAR Xfinity Driver Ryan Vargas has been growing behind the wheel in stature and skill ever since he started racing at Irwindale Speedway in Southern California on Saturday nights. But no matter how much he won, the security at Irwindale found it hard to believe he was old enough to be a winner down on the track. Now Vargas is a step away from the top of all American stock car racing. Listen…