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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
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Subwoofer Added on Stock Sound System | GOLFMK7 - VW GTI MKVII Forum / VW Golf R Forum / VW Golf MKVII Forum
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Long Term Review: Helix Sound Upgrade | Stealth GTI