David Incorporated Esq.
Member
Rennlist is a pretty decent brand specific forum; though there are plenty of know-nothings there are a ton of people who are extraordinarily knowledgeable without too much bias.
As far as forums for general car nonsense for actual enthusiasts one of the best I've seen is actually Something Awful's Automotive Insanity subforum. It has a good volume of people posting and is generally pretty civil, knowledgeable and inclusive. Worth browsing, at least.
Edit: This thread is weird, though, people tend to get riled up really easily and I'm not sure why.
As far as forums for general car nonsense for actual enthusiasts one of the best I've seen is actually Something Awful's Automotive Insanity subforum. It has a good volume of people posting and is generally pretty civil, knowledgeable and inclusive. Worth browsing, at least.
Edit: This thread is weird, though, people tend to get riled up really easily and I'm not sure why.