Odd about Acura World...the number of total messages doesn't exactly jive with what their individual forum totals add up to for posts. The entire landing page for the site contains threads with no replies. To me, that says the forum is dead.
Yet there's Acurazine, which has a lot of activity but, alas, is hosted by a company I don't like (scroll down to the bottom). Another forum, mdxers.org, is also with VerticalScope but has activity. There is also TSXclub hosted at Verticalscope, which I've had to visit a few times. The problem with that forum is that the TSX hasn't been sold since 2013, so most of the content is older, and getting current answers is difficult.
One thing I noticed VS doing is registering domains and creating forums for upcoming car models. They are gambling on owners flocking to them and generating ad revenue. They get a little activity, but not like the older forums that have been around since the 2000s.