Busch finished Sunday's event at New Hampshire Motor Speedway in fifth place, but during the inspection following the race his car was found to be lower than the minimum allowed for the left front fender.
As a result he has been docked 25 points in the drivers' standings, his boss Joe Gibbs has been deducted the same amount in the car owners' ranking, while his crew chief Steve Addington has been fined US$25,000 and placed on probation until the end of the year.
Despite the penalties, Busch remains in 13th place in the championship, the first driver outside the Chase for the NASCAR Sprint Cup.
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