You mean I really have to get every single file together and put them into Wad Updater to get the cars.wad? I remember that I have already extracted a cars.wad of a CSM Mod someone with CSM, but I forgot how.
There is no cars.wad in a CSM Mod. That's the point of CSM - it builds it for you.
If you disable Quickstart then CSM will build the cars.wad (and the rest of the files needed for the mod) but won't start the game. Then you can go into your GP4 folder and grab the cars.wad.
Sure you can. But most mods don't have a pre-built cars.wad in them (there are exceptions, like the ones you have stated). I was assuming TGF1 was looking for a way to get a cars.wad out of a mod that didn't have a pre-built one already.