Good Ol' Time Racing Association: GOTRA is a vintage dirt modified racing organization for racing coupes and sedans dated 1928 through 1948.
S.M.A.R.T.: Southern Modified Auto Racing Teams sanctioning body, based in Kernersville, North Carolina.
United Midwestern Promoters: UMP is an open wheel modified sanctioning body.
USA Modifieds: News, schedule, driver profiles, point standings and rules.
USMTS: United States Modified Touring Series, including forum, schedule, results, points, and driver information. Also includes information about the United States Racing Association.