I'd probs message the OP of this thread:Anyone know which GR Yaris forum is most active? Want to start searching for parts and other expertise in anticipation of the GRC.
Thanks,
Long time lurker thereThe most active is definitely GR Yaris Owners Club - UK Forum.
I scan it occasionally. There are hundreds of posts about common issues and annoyances, as you'd expect from any active forum. There's also https://www.gr-zoo.com/forums/gr-yaris-general-discussion/. Those are the two most active GR Yaris forums.