Okay guys so the USA modifieds and the ARA series both run modifieds that the back tires are enclosed by the sheet metal right? But if you look at 90% of the cars on racingjunk.com all the tires are exposed with nerf bars around them. I'm in need of help as to what the difference is in the cars. I want to race the USA modifieds but can't find a car. Thanks
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What you're seeing on racingjunk are likely the Nascar-style modifieds. The USA mods appear to be IMCA/UMP style modifieds for asphalt. The USA modifieds site has a forum that it looks like some of their racers use, including classifieds.

www.usamodifieds.com

they cant be IMCA because on IMCA there back tires are exposed on 1 side of the car with nerf bars around them.

Check out Howe Racing Supplies.com
Most of the cars that compete in this series race weekly at Angola Speedway, Bearfield Speedway, and Kalamazoo Speedway, you might check their websites for classifieds.