I've haven't explored this one and it's not in English
http://downloads.xtremefactor.es/descargas/viewcategory/5-mods-rfactor.html
Dirt, dirt and more dirt. http://thedirtpile.net/mods
We all need more dirt!
Love the look of this site, nice clean sharp layout...Great track site for F1 and Formula E tracks.
https://akosfodi.wixsite.com/fodiakos/rfactor-tracks