Before beginning, it is important to understand how ELS works at the code level. Parts named “extra” are those which will appear randomly on a vehicle as it spawns in the game. On default game vehicles, extra parts are normally ads (as on busses or taxis), roof scoops, supplemental grilles, and other such vehicular accessories. Any given GTA V vehicle can be outfitted with a maximum of 12 of these (extra_1 to extra_12). These parts can be added onto or removed from a vehicle in-game at any time by use of special code. ELS makes use of the extra parts system by toggling extras on and off at various intervals in order to mimic light flashing patterns.