I've been on car sites before.
This isn't the first site i've been on, but it's one of the ones I'm most active one.
www.htuner.com is my "home" forum. I won't bore anyone with the story but the owner/creator is a great guy and for Honda people it's a safe haven, tons of true pros there, everyone is mature, most people actively race. It's a small site but it's a great mix of a ton of personal friends and net buddies.
I've helped start a few sites and modded on others, honestly I like it here, pop on read posts learn some and be done, no coding, no dealing with members fighting spam etc.