The ENY limiter is a control mechanism added by HiTech that progressively disables a side's access to low ENY aircraft like the La-7 (ENY 5), P-51D (ENY 6), N1K2-J (ENY 7), ect, ect if the player numbers get too imbalanced. For it to start there must be at least 200 players in the MA and one side must have, IIRC, 135% of the player numbers of the lowest side. The greater the percentage, the higher the ENY of the disabled aircraft up to ENY 40 at 210%, IIRC.