Audi TT 2011 model upgraded with Grundig GX-3800 CarPlay stereo Recent Installs - Audi TT 2011 model upgraded with Grundig CarPlay stereo using the Connects2 CTKAU03 fitting kit. Grundig GX-3800 Installed Grundig GX-3800 Installed Grundig GX-3800 Installed Grundig GX-3800 Installed Grundig GX-3800 Installed DAB Aerial Old Radio