How to install an amp in a VW MK6 GTI pt.2 - YouTube
For those of you who want more bass but don't want to sacrifice your spare tire or hatch space, I highly recommend this spare tire mount subwoofer : r/GolfGTI
2011 Volkswagen GTI custom subwoofer enclosure and speaker upgrade - Handcrafted Auto Marine & Offroad
Auto Front Rear Door Bass Loudspeaker Speaker For Vw Jetta Mk5 Golf 6 5 Mk5 Mk6 Gti 2009 2010 2011 2012 2013 5kd035454 - Multi-tone & Claxon Horns - AliExpress