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  1. #1

    Need some info...

    09 Yamaha fx sho
    mods:riva air intake
    riva ff exhaust
    riva intake manifold kit
    r&d bov

    Do i need to do impeller?
    thinking dynafly 13/22?


  2. #2
    Site Admin Green Hulk's Avatar
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    Any time you increase power output you need to increase pitch of the impeller to match the power. The 13/22 Solas would be a good one. It's the same impeller Riva recommends with the stage 1 kit. Basically same performance mods as yours.

  3. #3
    Addicted Member 5001craig's Avatar
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    Engine mods without an impeller will not give you gains in speed.

    My .02.

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