which is the best, the most useful and helpful M3 forum out there which someone has experienced..?
I am comparing i tour E-60 one as comparison...

Thanks

 

This one

But you need to surf a bit to weed out the dips from the people who know what they are talking about.

http://www.m3forum.net/m3forum/

If you have an E46 M3 the participation is about 10 fold what this forum is and this is the best E60 forum