Now, evidently, most people don't care about this corner of the forum and as I can see from the other threads, this would probably also go unanswered but hey, I tried.
I've tried searching the depths of google but as of late 2023, it seems to be one of the best kept secrets of GTA V modding communities since there's virtually no data available on this anywhere- how does the ELS-hybrid system work? I had the misfortune of coming across one such car and I assumed that meant that it has both ELS and non-ELS versions inside. Much to my horror, that's not the case. Thanks to an entirely different ELS-hybrid pack I found while googling, it explained it's a combo of ELS and non-ELS but there's literally no guide on what to do, how to install it or activate it anywhere. I just get some random bleak vanilla siren lights when I press "J" in my ELS UI even after copy-pasting the associated vcf file. Anyone know the secret sauce?