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The Performance Index (commonly abbreviated as P.I. or PI) is a car performance measuring system that has been used since Forza Motorsport 2.

It displays a vehicle's overall performance value, which is determined by top speed, acceleration, braking, handling, and launch rating, as well as weight. Each performance element is rated from 0 to 10.0, although the minimum for each is always 3.0. It is shown by letters (F to A, then S, R, P, U, or X) and then a number starting from 100 and capping at either 999 or 1000.

Any vehicle's performance index can be increased by applying power-improving and weight-saving upgrades. Players can also decrease their P.I. value by adding weight and using a drivetrain conversion.

In the Forza Horizon games, there are no cars ranked X 999 by default.

Classes Edit

Class FM2 FM3 FM4 FH FM5 FH2+FF7 FM6+FM6:A FH3 FM7
F - 100-200 100-200 - - - - - -
E - 201-275 201-275 100-200 - - 100-300 - 100-300
D 0-400 276-350 276-350 201-300 100-400 100-500 301-400 100-500 301-400
C 401-550 351-425 351-425 301-400 401-500 501-600 401-500 501-600 401-500
B 551-700 426-500 426-500 401-500 501-600 601-700 501-600 601-700 501-600
A 701-850 501-600 501-600 501-600 601-700 701-800 601-700 701-800 601-700
S 851-998 601-700 601-700 601-700 701-800 - 701-800 - 701-800
S1 - - - - - 801-900 - 801-900 -
S2 - - - - - 901-998 - 901-998 -
R3 - 701-800 701-800 701-800 - - - - -
R2 - 801-900 801-875 801-900 - - - - -
R1 - 901-999 876-998 901-999 - - - - -
R - - - - 801-900 - 801-900 - 801-900
P - - - - 901-998 - 901-998 - 901-998
U 999 - - - - - - - -
X - 1000 999 - 999 999 999 999 999

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