Xtreme Car Forum: Enthusiast in Training
Tuner Show Car & Truck Race Community Discussion Forum
xtremecarforum.com/

CarForums.net
Auto enthusiast chat forums with discussions about domestics, imports, classics, exotics, sports cars, 4x4s, and many other vehicles.
www.carforums.net/

Ford Mustang forums
Ford Mustang enthusiast site mainly dedicated to the first generation Mustangs but open to all Mustang owners and fans. You can find a discussion board, pictures, videos, news, classifieds and more.
www.mustangv8.com