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  1. #1
    Hueneme Beach Ca.
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    Jul 2010
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    Gutting or boring water box?

    Any input on how much louder it will be? I know it's hard to quantify how much louder, but give your best opinion.
    I have the rear outlet exhaust and it's louder at low RPM but it sounds pretty stock at WOT.
    I'd like to get some sound while at speed.
    Are guys cutting out the middle plate with the holes in it completely? How about boring a 4" hole through the middle?
    I'm just curious as to what to expect and the best way to approach it.
    Thanks


  2. #2
    hitman's Avatar
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    Aug 2006
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    I have heard there is not much gain in modding your waterbox and not much gain through waterboxes in general. I still haven't seen anything to back up Riva's claims on their waterbox.

  3. #3
    Hueneme Beach Ca.
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    Jul 2010
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    Hueneme Beach Ca.
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    I think I'm just going to weld up some aluminum tubing and eliminate the box altogether. I can always take out the tube and put the box back in if it doesn't work like I want.

  4. #4
    txgp1300r's Avatar
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    I just finished one last week for an ultra 150....it sounds like a v-8 pickup truck with duals..very nice......take a band saw and cut both caps off the box , remove one baffle and hole saw a 2 to 3 inch hole in the center baffle, shorten the inlet and outlet tubes so that they are not so close to the wall of the box....it may not speed you up but it does sound healthy.....the ultra actually picked up a little quickness ....put the end caps back in place and tig weld ...I like to pressure test using air and soap bubbles so that no exhaust gas gets into intake air... hope this helps

  5. #5

    Join Date
    Mar 2010
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    the moon
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    Did you gain any performance by gutting your water box. would love my sho to sound like a big V8.

  6. #6
    Hueneme Beach Ca.
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    Jul 2010
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    Hueneme Beach Ca.
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    I ran a straight 3 1/2" tube right off the exhaust manifold to the back of the boat and it's REALLY loud. I took it right back off.
    Then I took the water box and band sawed the end of it off and took out the middle plate completely. I cut 1/2" off the exit tube inside the water box too. Now it seems to me that this should be almost as loud as the straight tube. It isn't. Not even close. I don't think it sounds much louder than the stock water box. I'm still trying to figure out why it's that much quieter. I really don't get it.
    I haven't ridden it like this. It's all been done in the parking lot of my shop.
    I think I'm going to get up early and go ride it before work tomorrow.
    I'll be shocked if I pick up any speed, but you never know.

  7. #7
    305coco's Avatar
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    May 2007
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    cape coral, florida USA
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    the more you cut the exit tube the louder it gets

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