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The F Class is a Car Class introduced in Forza Motorsport 3, and featured in Forza Motorsport 4, that classifies vehicles ranging from a Performance Index of 100 to 200. It is, so far, the lowest car class in the series, and typically consists of low-performance production cars.

Every F Class car can be moved to a higher class by upgrading its Performance Index to a number above 200.

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