It looks like they are implementing HDR for rFactor2
http://www.racesimcentral.com/news/2011/09/rfactor-2-wip-screens-show-hdr-effects/
I guess that being supposedly scheduled to release later than rFactor2, C.A.R.S. will follow suit...
Edit:
PS: original photos are 3300x1040, watch them full res to have a better idea:
http://www.racesimcentral.com/news/wp-content/gallery/rfactor-2-hdr/rFactor_2_HDR%201.jpg
http://www.racesimcentral.com/news/wp-content/gallery/rfactor-2-hdr/rFactor_2_HDR%203.jpg