Amazon.com: Add A Bass Subwoofer Amplifier Adapter Interface w/Amp Remote Wire to Factory OEM Car Stereo Radio for select VW Made for Jetta Golf CC Passat EOS Tiguan etc- Vehicles listed below :
2009-2017 VW TIGUAN - Front DOOR Speaker / Woofer 5N0035454B | eBay
Subwoofer install and review | VW Tiguan Forum
VWWatercooled Australia
2014 VW Tiguan Subwoofer Build | DIYMobileAudio.com Car Stereo Forum