Fine-tuning can be done by a player to modify their vehicle's performance. Fine-tuning can affect a car's gear ratios, aerodynamics, nitrous mixtures, acceleration, top speed, direct/indirect steering, oversteer/understeer and on/off-road relationships through direct adjustments by the player. If done correctly a player can easily perfect a vehicle to either their driving style or give their vehicle an edge in competition.
- Players should not use the same fine-tuning specifications for all events. For example, lowering a vehicle's top speed in favour of acceleration can help a vehicle perform well on a course with a lot of turns but may fall short on a course with long straights.