Amazon.com: Add A Subwoofer Bass Amplifier Adapter Interface w/Amp Remote Turn On Wire to Factory Car Stereo Radio for some 2015+ VW Volkswagen Vehicles - compatible vehicles listed below : Electronics
Installed a spare tire subwoofer in my GTI : r/GolfGTI
Customer Reviews: Focal Inside IS VW 165 6-1/2" component speaker system for select Volkswagen vehicles at Crutchfield
VOLKSWAGEN RABBIT/GOLF/GTI/R32 SUB ENCLOSURE 10" Mk5 and Mk6 - SRQ Customs