Engine Tuning: The ability to properly tweak a car’s power output by modifying things like air/fuel trims and boost pressure. Could be limited to the grade of upgrade parts installed on a vehicle, with a fully race-prepped engine being capable of much higher figures than a stock or lightly upgraded engine.
Eventlab Additions: The ability to choose a custom start location and grid formation, the ability to set or tweak AI vehicles individually, and some sort of driving line generator for players who can’t map out good lines on their own, rolling starts.
Expanded Customization: More bodykit and widebody options from different companies, fully customizable aero parts, like splitters, diffusers, and rear wings, more wheel options, interior customization (at least include OEM interior options and colors), fully adjustable wheel offset.
Player-created Bodykits: The ability for players to sculpt and mold unbranded parts to their liking (like Need For Speed: Carbon’s autosculpt feature).