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  1. #1
    baba850r's Avatar
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    best exhaust while still keeping O.P.A.S

    im after a better exhaust set-up for my nearly stock rxp-x.ive got a worx grate on it just now and thinking about the x-charger upgrade.
    as far as i know pirannas through hull is the only option??anyone tested it yet?
    as i understand the free-flow pipe has little or no gains and an annoying resonating noise.
    i will also gut the stock water box.

    so would gutting the stock water box and fitting whatever through hull gain any pick-up?


  2. #2
    Quote Originally Posted by baba850r View Post
    im after a better exhaust set-up for my nearly stock rxp-x.ive got a worx grate on it just now and thinking about the x-charger upgrade.
    as far as i know pirannas through hull is the only option??anyone tested it yet?
    as i understand the free-flow pipe has little or no gains and an annoying resonating noise.
    i will also gut the stock water box.

    so would gutting the stock water box and fitting whatever through hull gain any pick-up?
    +1 on that question.

  3. #3
    jpeconsult's Avatar
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    I think gutting the box will provide a few RPM increase, but mostly throttle response and deeper tone. I appreciate the through-hull exhaust does not provide MUCH gain.

    NOTE: Free-flow exhaust does have the resonance at 3000 RPM, but think about it...how often are you at 3,000 RPM? I am usually at idle (1,800), cruising (6,000 or slightly less) or WOT (8,100). I usually pass 3,000 RPM very quickly!

  4. #4
    baba850r's Avatar
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    Quote Originally Posted by jpeconsult View Post
    I think gutting the box will provide a few RPM increase, but mostly throttle response and deeper tone. I appreciate the through-hull exhaust does not provide MUCH gain.

    NOTE: Free-flow exhaust does have the resonance at 3000 RPM, but think about it...how often are you at 3,000 RPM? I am usually at idle (1,800), cruising (6,000 or slightly less) or WOT (8,100). I usually pass 3,000 RPM very quickly!

    is that the only time it has the resonance?
    what excactly causes the resonance?

    so there may not be much diffrence between the free-flow mod and a through hull?

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