The maximum of each Driver's stats is 99 (for example one driver can have a maximum of 99 Overtaking)

The maximum of individual Component stat is 60 (for example one component can have a maximum of 60 Speed)

The maximum overall car loadout stat is 312 (with the best loadout the top Speed stat is 312 for example)

When equipping a Boost or when an asset has a stat boost from being a featured or sponsored asset, the maximum stats are not capped (for example if a Driver had 99 Overtaking and equips a Boost with +10 Overtaking, they will then have 109 Overtaking stat)