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New muffler on my 4-1 system XJ 750

Discussion in 'XJ Technical Chat' started by Rickard S, Jun 23, 2019.

  1. Rickard S

    Rickard S New Member

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    Hi. I have a huge muffler today and no exhaust sound at all.. I will install a SC project muffler with dB killer. Will that impact motor and/or carborator performance and or air inlet expansion need?. My hope is to get nice sound and higher effect.

    Any experience?.
     

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    Rickard S, Jun 23, 2019
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  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Hmm.... I'd need to know what sort of sound deadening is used.
    Is it glass packed, or steel baffles?
    Is the DB killer an extra baffle that fits on the outlet? And if-so what shape does it have?

    The stock system is very free-flowing, so unless that muffler is more restrictive (doubtful) you likely won't need to do anything (aside from maybe adjusting the idle mixture screws).
     
    k-moe, Jun 23, 2019
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  3. Rickard S

    Rickard S New Member

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    047E4B5C-B72B-49EA-A788-5F06C482C31E.jpeg Hi. It’s more open and more exhaust air flow possibility and the DB killer is a tube of steel with a pin where you have drilled holes in it and are pleased in the back of the muffler and are possible to take away and put back.

    As you can see on my attached picture the existing muffler is really silent and I need more roaring sound
     
    Rickard S, Jun 24, 2019
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  4. Rickard S

    Rickard S New Member

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    A1421AC8-E10C-408A-90B3-C0A45F1787A3.png 8AD65DD4-0613-482B-B758-A0A6AB82EE1B.png Picture on the two different mufflers I have bought.

    Could you see any problems with these compared to the existing one impacting negative on engine performance?.

    Regards/Rickard
     
    Rickard S, Jun 24, 2019
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