If you haven't already found a good V4 forum I'd recommend checking these guys out:
A bunch of us Magna/Sabre/Interceptor owners on there. Current content & tons of archived stuff. None of the good stuff is searchable without an account though, so if you don't see anything it's because you're not logged in. I thought the site was dead when I first got my Magna until I got an invite from a member & was able to get logged in.