I hate having tiny little forums for everyaspect of something.
This board is split up by model and that's good enough. It has an overall suspension forum and audio etc. Many questions a Sedan owner will ask in audio apply to the P5 as well so I see no need to have a seperate P5 audio forum for instance. Same goes for suspension and engine builds. There is a lot of basic knowledge and info to be had, not every P5 owner will have that info.
Also, sometimes i'm just surfing for no reason in the general forum and see a questions I know I can help with, so I duck in and respond, I will not go through each tiny, dead forum to see if there is anything that interests me. That's the beauty of THREADS, you can see all of them and participate or not. But to segregate each thread type seems pointless. All the moderators would ever do is re-direct threads to the "proper" forum.