If you only own and use the Rfactor2 for one thing it should be this BTCC pack. The single greatest DLC currently available.

Link to steam BTCC car pack 3 - https://store.steampowered.com/itemst...

All cars have to be bought over multiple packs, however since the recent update you only need to own the car you drive and the track to join a race server. You won't regret it.

PC SPECS
AMD 5600x
MSI MAG B550 Tomahawk motherboard
MSI Geforce Ventus V3 3080 10gb OC
32GB Corsair Vengance RGB 3200mhz RAM
1tb Crucial M.2 SSD
2tb Crucial M.2 SSD
Fractal Compact 2 case
Cosair 750w fully modular PSU
Oculus CV1

Fanatec CSL elite PS4
Fanatec Mclaren GT3 V2 Wheel
Fanatec CSL Elite Pedals with Load Cell
Playseat - Project Cars