VW Retrofit LTD - Golf MK7 TDI upgraded with Helix subwoofer kit. 2h ish job including fitting and programming sound parameters. Quite good results from such a small box 😊 | Facebook
Helix Sound Upgrade | Stealth GTI
2018 VW GTI SE Ep.188: Installing the Helix Subwoofer Kit - YouTube
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NEW GENUINE VOLKSWAGEN VW GOLF 6 7 POLO HELIX SOUNDSYSTEM SUBWOOFER 000051419B | eBay
Helix Subwoofer and Golf R | Page 20 | VW Vortex - Volkswagen Forum