Car Classes
Dynamic Day, Night, and Weather
Police cars chasing you. If the police sees you racing on the streets, they will start chasing you. They won't stop chasing you when the race ends.
Racetracks with layouts
Traffic
Drag Racing in both on the streets and if there is a dragstrip track, on the track

Turn signals and hazard lights for traffic immersion.
Make traffic diverse- buses, trucks with trailers, different types of cars and taxis.
More luxury cars- mercedes benz, rolls royce, bmw, etc.
Have both automatic and manual gearboxes simulated.

Missions like package courier, taxi, heist, etc.

seriously everything mentioned above is unnecessary, imho free matchmaking is the priority

Think MIDNIGHT CLUB2 With Multi-Player.....

Realistic physics and Force Feedback. Cars should feel like they have weight and grip.

all pedestrians - paul walker

more realistic car, better physics and better mode to personalize cars

more bumpers, more skirts, i want complete personalization for the car!

I mean, the only thing I want is to keep the sizes of the roads somewhat realistic. txr did it back in the day, shouldn't be too hard to do it today

Arcade physics just like wangan midnight maximum tune

Ability to integrate personal music library or online music streaming service. This would then be dynamic and react to the car POV chosen, as well as be heard by players nearby.

release a alpha/beta gameplay to see how the game it will look

Allow us to Mod engine sounds.

Wangan, kanjo loop, fitment adjustment

Steam workshop support in multiple areas of the game (cars, liveries, tunes and maps)