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  1. #21
    Moderator RX951's Avatar
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    Quote Originally Posted by Water4fire View Post
    Billie I have a NEW box and I don't think you need to ask them as mine is huge and looks real close in size to the 1300r freeflow. Measure the freeflow and I will let you asap. Unless you plain on making your own freeflow. If so don't worry about it!.

    .
    roughly 3-3/4" opening. I have a Blue RIVA free flow hose and my current GPR home made free flow with the aluminum tube


  2. #22
    Water4fire's Avatar
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    Billie, My exit on my MC-1 waterbox is 3 1/2 inches.
    Hope this helps, Austin


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  3. #23
    Moderator RX951's Avatar
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    Quote Originally Posted by Water4fire View Post
    Billie, My exit on my MC-1 waterbox is 3 1/2 inches.
    Hope this helps, Austin


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    thanks bro

  4. #24
    miagp21's Avatar
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    Hi guys, this might be a stupid question but can't you just eliminate the waterbox and make it straight to the exhaust?? Is there really that much of a difference in back pressure when running a waterbox as opposed to straight back??

  5. #25
    Hydrotoys's Avatar
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    The waterbox is a muffler. It's not a backpressure issue. It's a noise issue.

    We've run straight exhaust, and it's loud. Very loud. Deafening loud.

  6. #26
    Greenhulk Grasshopah (DRC) HallPass's Avatar
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    Quote Originally Posted by Hydrotoys View Post
    The waterbox is a muffler. It's not a backpressure issue. It's a noise issue.

    We've run straight exhaust, and it's loud. Very loud. Deafening loud.
    deafening loud??

    you couldn't do anything to eliminate this? Loud being like the bumble bee?

  7. #27
    Hydrotoys's Avatar
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    It's LOUD.

  8. #28
    Greenhulk Grasshopah (DRC) HallPass's Avatar
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    Quote Originally Posted by Hydrotoys View Post
    It's LOUD.
    makes me want to do a straight exhaust



    what does it compare to like a gpr with full metal tubing free flow setup?

    if you wanted it more loud couldn't you just make the free flow tube itself from the waterbox all metal.. or bent metal tubing?

  9. #29
    Hydrotoys's Avatar
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    Kale,
    the MC1 waterbox (or a modified stock box, or a Rotax racing waterbox) with whatever pipes you use isn't terribly more loud than a gpr with some freeflow, only deaper.

    However a straight piped RXP engined ski with a 3.5 exhaust outlet almost makes your ears bleed. It's that loud.

  10. #30
    miagp21's Avatar
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    So in this case, what would be easier/ recommended to modify, the stock gpr waterbox or the rxp waterbox?? Also, is there a big difference in pricing from the MC-1 to modifing either gpr/ rxp stock waterbox??

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