hey igor, how about something like in the manufacturer forums have all the racecars they have. e.g. under audi the R8. i guess companies like BMW wouldnt nesacarilly have to one cuz its the M3 GTR, but for F1 you could have the BMW-Williams F1 car. just a suggestion..

I think it'd be about the same if you went to Racing (http://www.automotiveforums.com/vbulletin/f718/) and posted under the type of race the car competes in. Is that what you're looking for? Many race cars have road-going counterparts, so they should already have their own forums.