BMW land forum?
Only just come across it tbh and considering I have previously owned an E36 318is coupe and a 520i se struck me as a nice place to discuss others in the BMW range.
Looked at it a few times but never registered. The problem with too many sites is that people end up cross-posting to all of them. That used to happen before there was a dedicated SLK forum, and once that was set up almost everyone migrated over.