In Modified Sport-- For 2 seat sports cars--you can run fuel or gas, NA or Supercharged (blown). Coupes can chop the top (windshield must have a 5" vertical height) Wheel base maximum is 130", any frame, body can be channeled . Any aero mods ahead of and including the cowl (front wheels may be enclosed). Full belly pan and engine swaps any location is legal. drip rails may be removed. windows may be flush with the body. Skirts, spoilers and strakes allowed. front track may be narrowed to 27". This class is essentially Comp Coupe for 2 seat Sports cars including convertibles
In Modified GT--For 2 seat sports cars--stock body, stock wheel base. one of the following mods required- full belly, QC rear end, engine swap or FWD to RWD or RWD to FWD Gas only but blower legal. Air dams, splitters, spoiler (non roof mounted unless stock) are legal. This is essentially Gas Coupe for 2 seat Sports cars including convertibles
In GT Sport--For 2 seat Sports cars--Gas only, No blowers, stock body and wheel base. (including stock gas tank which do need to be used) Wheel openings may be radiused for clearance. This is essentially Production for 2 seat Sports cars including convertibles.
Hope this helps
In