Heres a  list of Australian car forums for specific makes and models of vehicles listed.

BMW car forums
http://www.bimmerforums.com/

Holden car forums
forums.justcommodores.com.au
forum.streetcommodores.com.au

Ford car forums
www.fordforums.com.au
www.fordxr6turbo.com
http://www.fordxr5turbo.com/forum/

car club

Chrysler car forums
www.hemiperformance.com.au/forum (site appears down)
http://www.moparchat.com/forums/ (site was down recently)
http://www.moparmarketforum.com/forum/index.php

Mazda car forums
www.ozmazdaclub.com
http://mx5cartalk.com/forum/
http://www.rx8club.com.au/forum/
http://www.astinagt.com/forums/index.php

Nissan car forums
www.nissansilvia.com/forums
forum.pulsar.org.au
www.skylinesaustralia.com/forums
http://www.nissanmurano.org/

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Toyota car forums
http://www.supraforums.com.au/forum/
http://au.toyotaownersclub.com/forums/index.php

Mitsubishi car forums
www.delicaclub.com (delica users)
www.ozevo.com (Model specific Lancer GSR and Evo forum)

Honda car forums
www.ozhonda.com/forum
http://www.hondasuv.com/members/

Daewoo car forums
No Daewoo forums found

Hyundai car forums
No Hyundai forums found

Subaru car forums
www.wrx.com.au/forum

Ferrari car forums
http://www.ferrarichat.com/forum/australia/

Peugeot, Citroen, Renault,  French Makes of motoring clubs
www.aussiefrogs.com/forum

Renault Sport & car forums
www.ozrenaultsport.com/forum

Subaru forums
http://www.subaru4wdclub.com/

VW forums
http://www.vwwatercooled.com.au/forums/index.php
http://forums.tdiclub.com/

Other car clubs around Australia
www.aussiecarforum.com
www.performanceforums.com
http://www.outerlimits4x4.com/