Good Ol' Time Racing Association
GOTRA is a vintage dirt modified racing organization for racing coupes and sedans dated 1928 through 1948.
I.M.C.A.
International Motor Contest Association, based in Vinton, Iowa. Classes include modifieds, late models, sprint cars, stock cars and hobby stocks.
NEI Dirt Tour
Northeast Iowa Dirt Tour features the dirt modified drivers and events.
S.M.A.R.T.
Southern Modified Auto Racing Teams sanctioning body, based in Kernersville, North Carolina.
Small Block Modified Driver and Owner Association
Information on membership, calendar, newsletters, photos, feature wins, and related links.
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.