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  1. #1
    Junior Member mdkammer's Avatar
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    stock muffler mod

    ok I heard the pros / cons about loud shiny pipes but wondering if anyone has tried to mod the stock baffle buy cutting off the reduction end where it goes from one inch to 5/8 im sure it would open up the pipe but while retaing the spark arrestor and I would imagine still keeping enough back pressure . any thought would be appreciated thx
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    Senior Member PlacerLode's Avatar
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    I've only heard of the mod where you remove the spark arrester / tail cap then take an aprx 1.5" hole saw on a 12" extension and drill out the core then replace the spark arrester I hear it adds to the bump but not quite as loud as a DG or FMF
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    Senior Member elime's Avatar
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    I tired removing the end cap and spark arrestor to see if there was a performance gain. If there was a gain I couldn't detect it.

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    Senior Member pred's Avatar
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    A small restriction usually equals torque,
    Free flowing can free up some HP,
    On our little lawn mower bikes I would prefer torque that a loud screaming exhaust at 8000 Rpm.
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    Super Moderator littletommy's Avatar
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    When I put my 45* degree copper street elbow on, the resistance gave me more torque and increased my HP by about 10 horses.
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    Junior Member mdkammer's Avatar
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    thx for the reply a little more noise wont be bad and if any hp or toque is gained a plus also
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    Senior Member scotti158's Avatar
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    If I remember correctly, Lizrdbrth posted that no improvements could be made to the exhaust system to increase hp with a stock engine. That included modding the stock exhaust or using an aftermarket exhaust. The stock exhaust was as good as it gets with a stock engine in his opinion. I've always been disappointed when I've "upgraded" to a different exhaust on a bike. Lots more noise and little to nothing performance gain, and that's with using recommended carb jets and settings. Your time is better spent riding it and your money better spent on mods that will have a benefit. Just my opinion. (based on experience)
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    Senior Member pred's Avatar
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    Resistance = low end torque
    open exhaust you lose low wnd torque
    Ide rather have torque than hp any day.
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  10. #9
    Senior Member sponge's Avatar
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    Figure about 5% gain in HP max if you go whole hog, intake, jets, exhaust, on this low tech 2 valve motor.
    So doing the math, 13 HP on a good day X 1.05 = 13.65 HP (a modest gain that you likely wouldn't notice)

    I have messed with this on a number of bikes over the years, 5-10% on a 100HP sport bike can be felt. The reduced weight of replacing steel with titanium or carbon fiber even more. The HP gain doesn't necessary reduce torque, there are in fact usually gains. But there torque curve is often less linear. Strong spots and flat spots is the typical outcome. For track use where you can just keep the engine in the sweet spot it is worth it. For riding around town it sucks, (but sounds cool)
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    Senior Member grewen's Avatar
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    Quote Originally Posted by littletommy View Post
    When I put my 45* degree copper street elbow on, the resistance gave me more torque and increased my HP by about 10 horses.
    still funny LT!!
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