Kurt Busch (41) smokes after his engine blows up on the backstretch during the NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Sunday, May 25, 2014. (AP Photo/Chris Keane)
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Kurt Busch (41) smokes after his engine blows up on the backstretch during the NASCAR Sprint Cup series Coca-Cola 600 auto race at Charlotte Motor Speedway in Concord, N.C., Sunday, May 25, 2014. (AP Photo/Chris Keane)
