http://store.steampowered.com/app/619680/Assetto_Corsa__Ready_To_Race_Pack/
£5.99 in UK (don't know other currencies)
Cars
- Audi R8 LMS 2016
Audi R18 e-tron quattro
Audi TT Cup 2016
Audi TT RS (VLN)
Lotus 3-Eleven
Maserati MC12 GT1
McLaren 570S
McLaren P1 GTR
Toyota Celica ST185 Turbo
Toyota TS040 Hybrid
No description of other improvements that I've found yet
