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  1. #1

    Exhaust hose reducers for TDR waterbox?

    Anyone know a company I can buy two 4" to 3.5" reducers? Im running the TDR waterbox and the couplers the riva thru hull kit comes with doesn't work with the the waterbox so I need reducers.


  2. #2
    The riva pipe is 3.5" so you need something that reduces to smaller or the tdr box has 4" piping?

  3. #3
    KamikazeGPR's Avatar
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    A lot of us use frozenboost for our intercooler & exhaust parts. Their T-bolt clamps are good quality too for the price.
    https://www.frozenboost.com/intake-pipe-reducer/

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  5. #4

  6. #5
    Quote Originally Posted by KamikazeGPR View Post
    A lot of us use frozenboost for our intercooler & exhaust parts. Their T-bolt clamps are good quality too for the price.
    https://www.frozenboost.com/intake-pipe-reducer/
    Thank you! should I have an issue with these on the exhaust components? Cause I can get the couplers locally but I don't want something that's going to give me an issue out on the water.

    Quote Originally Posted by Jmfmk3 View Post
    The riva pipe is 3.5" so you need something that reduces to smaller or the tdr box has 4" piping?
    Yeah im not sure if that was a mistake or not but my TDR waterbox has 4" inlet and outlets on it. I need something that reduces from 4" to 3.5" so I can run the thru hull from riva.

  7. #6
    That's pretty big.. But yea eBay or frozen boost

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  9. #7
    Thanks man. See if I can find them locally.

  10. #8
    Get it in 2 days with Amazon prime..

    Upgr8 Universal 4-Ply High Performance Straight Reducer Coupler Silicone Hose (3.5"(89MM) to 4.0"(102MM), Black) https://www.amazon.com/dp/B00CB21YKK..._3Prqvb1NW6K87
    https://www.amazon.com/dp/B00CB21YKK..._3Prqvb1NW6K87

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