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  1. #1

    Riva thru hull exhaust adapter

    I just purchased the Riva exhaust for my 2009 fx sho. I noticed Riva also had the thru hull exhaust adapter. Is this worth it as far as performance and cutting into the hull or just a cool add on with no power add?


  2. #2
    fx160's Avatar
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    If you send the exhaust out the back
    Instead of into the pump tunnel
    There is less drone

  3. #3
    Quote Originally Posted by fx160 View Post
    If you send the exhaust out the back
    Instead of into the pump tunnel
    There is less drone
    Ok. Can I just purchase the riva exhaust and the adapter or do I still need the waterbox in between?

  4. #4
    Ski Hacks MG's Avatar
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    For reference, here is my Riva through hull with the factory water box. It sounds very nice and does not have a noticeable sound up top when cruising or at WOT. The only drone is when you are just above idle, about to take off. There is no power gain from going through the hull.



  5. #5

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    I have been considering going with the worx thru hull. I just like that they use a silicone tube so that I do not need to worry about rust from salt water usage on it.

  6. #6
    Quote Originally Posted by CCW View Post
    For reference, here is my Riva through hull with the factory water box. It sounds very nice and does not have a noticeable sound up top when cruising or at WOT. The only drone is when you are just above idle, about to take off. There is no power gain from going through the hull.



    That sounds pretty mean. I assume that it sits just above the water line so water wont get backed up into it. Just nervous about cutting a 3-4" hole in my hull. Thanks for the info

  7. #7
    Ski Hacks MG's Avatar
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    Yes, it sits above the water line unless you are hauling around a hereford.

  8. #8
    Ale's Avatar
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    yes...
    less noise on thru hull exhaust agains free flow.

  9. #9
    I'm with the cool kids Mowerpan's Avatar
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    Quote Originally Posted by Ale View Post
    yes...
    less noise on thru hull exhaust agains free flow.
    I had the free flow and switched to the thru hull as the drone from the free flow exiting in the pump tunnel makes for very unpleasant drone while cruising. I noticed no difference in performance from any exhaust mods only sound. If you are not afraid of drilling a large hole in your hull I would go with the thru hull.

  10. #10
    I'm with the cool kids Mowerpan's Avatar
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    Water will not back up into the engine. That is what the waterbox prevents.

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