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  1. #1
    PWCToday Newbie
    Join Date
    Mar 2008

    ZXi 1100 Coffman Exhaust

    Does anyone know whether or not you have to install a coffman waterbox with the coffman pipe? Coffman's instructions say that their waterbox has to be used; Can a TDR Waterbox be used or can the original waterbox be used? Does anyone have a coffman exhaust pipe installed with or with a timing advance plate?

  2. #2
    Top Dog
    Join Date
    Jul 2008
    St. Amant, LA

    Re: ZXi 1100 Coffman Exhaust

    They say it does so I would guess for best performance you would want to do such. I don't know how a tdr would compare. The timing advance plate was part of the original coffman exhaust package. Also included a water injection unit which i don't know if that was for peak performance or noise control. With all said and done as the package claims 30HP gain.

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