Crew Chief Chad Knaus, left, talks with driver Jimmie Johnson, right, in the garage during practice for the NASCAR Sprint Cup series NRA 500 auto race at Texas Motor Speedway, Friday April 12, 2013, in Fort Worth, Texas. (AP Photo/Larry Papke)

Associated Press
Crew Chief Chad Knaus, left, talks with driver Jimmie Johnson, right, in the garage during practice for the NASCAR Sprint Cup series NRA 500 auto race at Texas Motor Speedway, Friday April 12, 2013, in Fort Worth, Texas. (AP Photo/Larry Papke)
Crew Chief Chad Knaus, left, talks with driver Jimmie Johnson, right, in the garage during practice for the NASCAR Sprint Cup series NRA 500 auto race at Texas Motor Speedway, Friday April 12, 2013, in Fort Worth, Texas. (AP Photo/Larry Papke)
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