You can get an E36 ITR BMW, race it in SCCA (ITR/DP), BMW Club Racing (JP) and NASA in a catch all class. That would seem to be the best bet for you as you seem to love the E36. I was at the BMWCCA race at Roebling last weekend and saw many really nice ITR/JP cars there...Bolt on a wing/dive plates and splitter and the car is competitive. Un-bolt said items and race ITR (or leave them on and run DP)