found and tested some new dirt modifieds and dirt tracks for nascar03 , very well done ,top shelf stuff for an older game
http://bigdonlinemotorsports.com/Downloads.html
some sweet short tracks here
http://www.shorttracksim.com/PostNuke/html/index.php theres a latemodel V2 mod here , not sure if its the one we ran years ago
http://www.racingrafix.com/