GOLF GTI FORUM

Hi guys,
Which one is the most popular German forum in Volkswagens and VAG group cars?
I'm mostly interested in those who are racing these cars (amateur rally, autocross etc)
It was somehow hard just to Google it.
Specically I'm looking for big European marketplace for used racing parts, tires, wheels etc.
German itself is not an issue as Chrome translate works good for me
Thanks in advance!

Guys, no ideas? Thanks!

No idea... Im not into German forums.

Kent iemand auto- of moto-marktplaatsen in Nederland en Polen?