A Steam commenter claims this is the full list of missing content:
Missing DLC:
Mitsubishi Car Pack
1992 Mitsubishi Galant VR4
1995 Mitsubishi Eclipse GSX
1997 Mitsubishi GTO
1999 Mitsubishi Lancer EVO VI GSR
2004 Mitsubishi Lancer EVO VIII MR
2006 Mitsubishi Lancer EVO IX MR
2008 Mitsubishi Lancer EVO X GSR
Hot Wheels™ Legends Car Pack
2018 Hot Wheels 2JetZ.
1972 Hot Wheels Chevrolet LUV.
1949 Hot Wheels Ford F-5 Dually Custom Hot Rod.
1969 Hot Wheels International-Harvester Loadstar CO-1600.
1957 Hot Wheels Nash Metropolitan Custom.
1957 Hot Wheels Studebaker Golden Hawk 'Dream Roadster'
Misc.
Quarz Regalia
1967 Sunbeam Tiger
1979 Talbot Sunbeam Lotus
A Steam commenter claims this is the full list of missing content:
So presumably the main expansions stay.
Ah perfect, thanks