VW CC Passat B6 B7 R36 Upgrade Speaker – SOUMATRIX
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 :
Boss BASS600 - Stealth Variant Subwoofer Install | Volkswagen Passat Forum