ARIZONA SPEEDWAY MUFFLER RULE



ARIZONA SPEEDWAY MUFFLER RULE

NOTICE TO RACERS: The Schoenfeld 14272735-78 Muffler is MANDATORY for Sands Chevrolet USAC SouthWest competition at Arizona Speedway in San Tan Valley. This is the same muffler required at Casa Grande’s Central Arizona Speedway. Failure to comply will be disqualified from the events.

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