Your exhaust will technically need a cat to be roadworthy, but depends on who's doing it and if it goes over the pits when you take it to Vicroads or not. Again technically you will need an airbox of some sort, just has to look factory. VN commodore ones can work quite well. Coilovers do need to be engineered to be legal. Your fuel reg won't necessarily be an issue for the RWC itself, they might not be keen on it.
Really depends on who is doing the RWC, as I personally wouldn't pass any of those things.