Same thing happened in Eurpe. Even with bodywork in the 90s you could still identify frames and different engines. Then came the TAG nonsense, specially Rotax, which was supposed to lower costs and so on. Last thing I learnt is kids running Jr classes for FIA/CIK World Championship races were paying between 10,000 and 25,000 euros per race, and they are running ¨spec¨ engines, junk compared to the old ICA, JICA and Formula A/Super A classes.