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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
    Join Date
    Apr 2005
    Morgan City, LA
    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
    Join Date
    Jul 2007
    Northeast Indiana
    Engine mods without an impeller will not give you gains in speed.

    My .02.

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