purple5ive summed it up pretty well.
The other forum was a bit quiet recently, for reasons that are too hard to explain, and I don't want to accidentally say something that will annoy any of the people involved.
The other forum was never 'necessary', but at the time when it started the software on
this forum was sh*t, which prompted a small group of frustrated Sydney guys (originally from this forum) to start the other forum in the first place. I still prefer the software on the other forum, but the software on this forum has improved a lot.
Nearly all of the active members on this forum are also active on the other forum.
There are a very small number of people who stopped using this forum when the other one was created, but most people (myself included) have been using both forums all along, which has annoyed the small number of people I just mentioned. That is why I think the other forum was never necessary, but I still really like both forums, and they both contain lots of great information.
MIDN1T3
Now this may sound crazy, but now I feel like I'm missing out if I dont go on the other one to check stuff, see what other people are doing to their cars
That's probably the main reason why so many people decided to try the other forum while continuing on this one too.