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Thread: Rebuilding an oem muffler to produce same effects as an aftermarket?

  1. #1
    Join Date
    2nd December 2004 - 11:46
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    '04 GS1200ss, '08 DRZ400SM
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    Christchurch, Hei Hei
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    Rebuilding an oem muffler to produce same effects as an aftermarket?

    I have just bought a new GS1200ss muffler ($1.50 from TM ).

    I am wondering if the guts of it can be rebuilt to give the benefits that can be got from an aftermarket (sound, power). It ought to be cheaper as the shell and pipe will fit without having to be built, saving materials and time. Secondly it might attract less "attention" from the sound police as it is "original"
    I have just found out that they have removed the word gullible from the dictionary

  2. #2
    Join Date
    5th February 2008 - 13:07
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    2006 Hyosung GT650R
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    I thought the same, but by the time I got it apart it was ; a.) fucked, and b.) no way in hell it was modifiable. That was a hyo 650 one.

    Good luck!

    Steve
    "I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
    "read what Steve says. He's right."
    "What Steve said pretty much summed it up."
    "I did axactly as you said and it worked...!!"
    "Wow, Great advise there DB."
    WTB: Hyosung bikes or going or not.

  3. #3
    Join Date
    23rd April 2004 - 19:16
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    2010 DC Skate Shoes
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    Roxby Downs, SA
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    Post up some pics. I know a lot of bikes are known to be able to have the exhaust modified to be a bit better flowing and also to release some extra noise from the motor. This is quite common on Ducati's, R1's and R6's. If you can drill out the rivets at each end you should be in business. Usually it'll require that you completely gut out the inside then you'll have to get some perforated pipe of the right diameter and then find a way to attach this (weld?) and then repack the canister before re-riveting the end caps with blind rivets.

    The process becomes difficult when the muffler is actually made up of three chambers with bridging pipes, but if you know someone with the right tools it shouldn't be a problem. Though at $1.50 you can't be that worried screwing it up.
    KiwiBitcher
    where opinion holds more weight than fact.

    It's better to not pass and know that you could have than to pass and find out that you can't. Wait for the straight.

  4. #4
    Join Date
    3rd October 2004 - 17:35
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    6,390
    if you take it to an exhaust guy he should be able to tell you, and at no material cost it'll be cheap as
    Then I could get a Kb Tshirt, move to Timaru and become a full time crossdressing faggot

  5. #5
    Join Date
    19th October 2005 - 20:32
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    M109R, GS1200ss, RMX450Z, ZX-12R
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    The internals of the GS muffler are pretty complexed

    There's a specialist welder halfway down Wells Street that could be worth asking to do the job. He does a lot of restoration work etc for classics and the such like.

    you'll have to tinker with the intake side of things too otherwise there wont be much benefit from the pipe alone

  6. #6
    Join Date
    5th February 2008 - 13:07
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    It would be cool if exhaust parts like perforated tube, outer tube, and end caps were cheaply available.

    I'm tempted to make some rollers to roll tapered reverse megaphones too.. that'd be fun.

    Steve
    "I am a licenced motorcycle instructor, I agree with dangerousbastard, no point in repeating what he said."
    "read what Steve says. He's right."
    "What Steve said pretty much summed it up."
    "I did axactly as you said and it worked...!!"
    "Wow, Great advise there DB."
    WTB: Hyosung bikes or going or not.

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