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bimodal exhaust

  1. rtmpgt

    V6 Vacuum Pump, is it on constantly?

    Hey gang, bit of a technical question for y'all. So as you guys probably know I have an SV6 with a functional HSV E1 Bimodal muffler pair that is currently plumbed into my engine through a custom intake spacer. However, I want to be able to have the exhaust turn off as well as be on so as to...
  2. 3onTree

    BI MODAL EXHAUST FAULT DIAGNOSIS

    Sharing recent experience sorting out my bimodal exhaust on my SSV (HM Headers aftermarket system). Most bi modal exhaust systems, use a vacuum controlled valve in the rear mufflers to divert exhaust gases to baffled sections of the muffler and to alternatively bypass the baffles and shoot...
  3. John Revill

    Retrofitting Bimodal Exhaust on VF Commodore 6.0L

    Hi All, I'm hoping someone can shed some light on an electrical question I have because I am a little confused. I have purchased a set of VF Series II bimodal mufflers and have successfully prototypes a control board to open and close the valves. Now it comes to wiring my control box to the car...
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