What are popular vehicle specific online communities?

[Sicarius]

Hyundai Forums.

[lucytheshedevil]

scions:
scikotics.com
scionlife.com

[gsrracer1]

http://Team-integra.net Hands down one of the best online community's for any Acura enthusiast.

[RemmyZero]

www.acurazine.com i was on this board for years when i had my tl, always helpful

www.g35driver.com my new home but i don't know about the relative size. it's fairly well populated although the members don't seem as active as the acura site.

[SapporoGuy]

My home away from home.
-- I banned myself from there since I wasn't getting any work done and wanted to finish my carpc.
PelicanParts

Pelican is a BMW/Porsche site but they run the forums to support their business of selling parts. Lot's of lawyers, doctors, pilots and military. lolo, I'm probably the poorest member there but I still drive my P-car

[checksum]

nissanclub.com

[Maheriano]

www.em2ab.com - for all EM2 chassis (2001-2005) Honda Civics. And I also happen to own this site.

[NoTec]

scions:
scikotics.com
scionlife.com

seconding this.

[Punky]

acurazine.com
all acura pretty much.

[Lincolnman]

Not vehicle specific but related
http://www.4btswaps.com/forum/index.php
Dedicated to diesel engine conversions and focused toward Cummins engines. Involves a large number of highly technical people, but admittedly leans AWAY from computers largely. There is support for those with computerized diesels as well, though.
http://www.midwestthundercats.com/
Site for owners of Ford Thunderbirds, Mercury Cougars, and Lincoln Mark VII/VIII of the MN12/FN10 chassis.
http://www.460ford.com/forum/
Site for everything Ford 385 series engine (370,429,460). This includes everything from industrial engines to mud boggers to truck pullers to drag racers. Some quite technical people.
http://www.ford-trucks.com/forums/index.php
Ford Truck Enthusiasts, a site for any Ford pickup, SUV, or truck from the 40s until now.


That's all I have for now.