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  1. #1
    pummsgtx255's Avatar
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    Riva free flow exhaust vs. Riva thru hull

    Hey I am new to the forum and i was wondering what the difference between the thru hull exhaust and the free flow exhausts from riva. Also what you guys like better. Thanks


  2. #2
    RXPJAY's Avatar
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    Pending what you want to spend, but thru hull is the way to go. You get an anoying droning sound at about 3000rpm. But its a cheap upgrade. With the thru hull you will need OPAS block off kit also.

  3. #3
    SplishSplash's Avatar
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    Quote Originally Posted by pummsgtx255 View Post
    Hey I am new to the forum and i was wondering what the difference between the thru hull exhaust and the free flow exhausts from riva. Also what you guys like better. Thanks
    Free Flow: removes the Resonator and uses the stock exhaust exit beside the pump. Free's up space to fit some intercoolers. Sound a little louder, minimal performance gain.

    Thru Hull, removes resonator, cross over hose, and plugs the pump exhaust. Required drilling a hole in trasom for exhaust. Allows for more room for an intercooler and removes the exhaust heat from the area of the intercooler. Sounds mean

  4. #4
    pummsgtx255's Avatar
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    Quote Originally Posted by RXPJAY View Post
    Pending what you want to spend, but thru hull is the way to go. You get an anoying droning sound at about 3000rpm. But its a cheap upgrade. With the thru hull you will need OPAS block off kit also.
    im planning on doing this on on i control ski so does that rule out the O.P.A.S block off then?

  5. #5
    stuckmoto's Avatar
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    Thru hull is the way to go unless you have a suspension model. If so - forget about it

  6. #6
    ATNryan's Avatar
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    Quote Originally Posted by pummsgtx255 View Post
    im planning on doing this on on i control ski so does that rule out the O.P.A.S block off then?
    Yes, no OPAS block off needed. If you are ever thinking of changing out the water box too, buy it now since it uses a different pipe for the thru hull (tho some have made it work with the original thru hull). Of course I am talking about the RIVA setup.

    What ski are you putting this on? I ran a free flow on mine, but removed it because of the noise, but will eventually go with a thru hull and water box later on.

  7. #7
    pummsgtx255's Avatar
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    Quote Originally Posted by ATNryan View Post
    Yes, no OPAS block off needed. If you are ever thinking of changing out the water box too, buy it now since it uses a different pipe for the thru hull (tho some have made it work with the original thru hull). Of course I am talking about the RIVA setup.

    What ski are you putting this on? I ran a free flow on mine, but removed it because of the noise, but will eventually go with a thru hull and water box later on.
    well right now i have a 2009 gtx is limited 255, but im buying a 2004 rxp very soon which i will most likley be modding i think i will go with the free flow for my 2009 gtx!

  8. #8
    dirtywork255's Avatar
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    I had a free flow on my T-X for a season just upgraded to the thru hull. You also have to get the intercooler relocation kit and opas block off. Go thru hull. Sounds nasty.

  9. #9
    I had the free flow on my 2012 rxt-x 260 talk about drone, their not kidding. I now have thru hull and a riva water box. Its much louder now.

  10. #10
    ATNryan's Avatar
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    Quote Originally Posted by ssenay72 View Post
    I had the free flow on my 2012 rxt-x 260 talk about drone, their not kidding. I now have thru hull and a riva water box. Its much louder now.
    I am sure it is louder, by how much tho? Also, there must be a lot less drone right?

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