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Video - Eight of the best NHRA Pro Stock Drivers arrived at Summit Motorsports Park in Norwalk, Ohio Eight of the best NHRA Pro Stock Drivers arrived at Summit Motorsports Park in Norwalk, Ohio, for the 2010 K&N Horsepower Challenge Sweepstakes. Eight lucky fans had a chance to win a new Harley-Davidson® Street Bob® motorcycle. Watch the battle between these top racers as they battle to win the K&N Horsepower Challenge Championship

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