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sound symposer

  1. Using the Sound Symposer Hose to Run Through the Firewall

    Fiesta ST Performance
    I've going to place a boost gauge in the driver side vent. Seems like folks have had trouble getting either wiring or vacuum hose through the firewall. I'm wondering if, after plugging the sound symposer, the cabin side of the symposer (basically a hose) could be used to access the cabin...
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