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  1. #11
    Crusty Information Officer Hammer166's Avatar
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    Quote Originally Posted by Krooser View Post
    Converters are a whole different ball game...



    If single exhaust won't allow a free enough flow why don't they derate the HP ratings on trucks with single stacks? Say it's 500 HP with twins but only 485 with a single exhaust? The answer is the duals don't make more HP... so the the HP rating stays the same.

    You can get a single muffler that flows more than 2500 CFM... that's a lot of air. Straight pipes will flow even more...
    Mainly because truck engine builders rate their engines on a test stand, with 'x' inches of intake restriction and 'y' inches of back pressure. If either of those numbers is exceeded, HP drops and BSFC increases.

  2. #12
    Road Train Member Powell-Peralta's Avatar
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    i'm basically trying to figure out which would be better for team operation.

    i'm thinking that all the exhaust, in most applications, comes off one manifold then if dual exhaust would split after the "Y".

    More mufflers=less noise since it's coming originally from one manifold?

  3. #13
    Road Train Member Les2's Avatar
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    Keep in mind duals will sound louder cause one pipe is closer to the driver in that application.

  4. #14
    Bobtail Member
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    You can split a manifold on a normaly asp engine but you cant running out the turbo beating1

  5. #15
    Bobtail Member
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    looking at a single exhaust typ.its mounted on the pass. side releaving the operator the noise

  6. #16
    Road Train Member Powell-Peralta's Avatar
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    i guess another way to rephrase the question is:


    If you took a truck with single exhaust and added a dual to it----using the exact same muffler and pipes as the original side, would this then be quieter than single exhaust?

    i'm thinking in theory yes. More mufflers= more noise reduction.

  7. #17
    Light Load Member magnum2's Avatar
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    let me ask you all this, those who know : what are pro's and con's of going with the one inch bigger exhaust from the turbo? I have the 2006 isx and after the Vgt there is the reducer to the smaller exhaust, vs the Vgt exhaust size. My pipe is beginning to rust through so, I was thinking about changing the pipe to the same size as the Vgt exhaust port, diameter wise. Should I do it or not? Why? Why not? Thank you.

  8. #18
    Crusty Information Officer Hammer166's Avatar
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    Quote Originally Posted by magnum2 View Post
    let me ask you all this, those who know : what are pro's and con's of going with the one inch bigger exhaust from the turbo? I have the 2006 isx and after the Vgt there is the reducer to the smaller exhaust, vs the Vgt exhaust size. My pipe is beginning to rust through so, I was thinking about changing the pipe to the same size as the Vgt exhaust port, diameter wise. Should I do it or not? Why? Why not? Thank you.
    The reason for the smaller outlet pipe is to increase exhaust back pressure so that the egr functions properly. I'd say you'll likely get a warning light unless the egr is already non-functional.

  9. #19
    Light Load Member magnum2's Avatar
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    Quote Originally Posted by Hammer166 View Post
    The reason for the smaller outlet pipe is to increase exhaust back pressure so that the egr functions properly. I'd say you'll likely get a warning light unless the egr is already non-functional.
    Besides the egr issue.

  10. #20
    Crusty Information Officer Hammer166's Avatar
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    Quote Originally Posted by magnum2 View Post
    Besides the egr issue.
    Open it up! Anything that makes a motor breathe better makes it more efficient. After saying that... I don't know if Cummins uses a map or a pressure sensor to control exhaust manifold pressure. If the ECM senses pressure, it could attempt to adjust the turbo to increase the exhaust manifold pressure, defeating the gains made by freeing up the outlet.

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