The Carfax 400 is the second NASCAR Sprint Cup Series stock car race held at the Michigan International Speedway in Brooklyn, Michigan. Introduced in 1969 as a 600 mile race, it has since been held as a 400 mile race. In 1973 the race was not held when new owner Roger Penske decided to replace it with an IndyCar race.
From 1998 to 2002, the race was known as the Pepsi 400 but had a secondary sponsor attached to the name of the event, most likely to avoid confusion with the Daytona race of the same name (now known as the Coke Zero 400). For 2007, the race was renamed to the 3M Performance 400 when 3M and Post-it transferred their sponsorship from the Citizens Bank 400 to the August race.
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