noboot - you won't see the car parked at the side of the road with a ped looking inside the trunk/hood.
ext_conv - Convertable, this means that the driver can jump in the car without opening door.
isvan - vehicle has van style rear doors.
truckfirefx - Larger flames when vehicle catches fire.
ext_strong - This flag means that the extras won't come off easily when you crash the vehicle. Without this, they come off in light crashes.
avoidturns - if the car is big, like bus, it will avoid sharp turns
big - the car is big (Duuhhhrrrr)
ext_requi - extra required, will always spawn with an extra.
truckenginefx - truck engine.
truckexhaustfx - more dust when changing gears .
ext_sunroof - switches the component at the top.
delivery - it's a delivery car so only spawns in the daytime.
livery - If the car has multiple different textures, it will randomize between them.
onlyduringofficehours - the car will only spawn during office hours and not at night.
ext_taxi - will cycle through extras named extra_5 and above.
ext_gang - spawns all extras simultaneously that are named extra_5 and above.
ext_script - has extra decorations on it which is activated with an external script (Useful with ELS, AI cars don't drive around with lights randomly on)
bangerexhaustfx - dirty smoke
ext_all - spawns with all extras.
ext_rare - spawning with extras will be rare.