Here's the links for two large ones, who should have outlets in the Köln area. http://www.duw.de (D&W) http://www.dts-tuning.de
Oh, I hope you're not offended by top-less girls, these web sites are full of'em
A forum community dedicated to all Volkswagen owners and enthusiasts. Come join the discussion about performance, builds, modifications, classifieds, troubleshooting, maintenance, new releases, and more!