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Diameter of the stock dual exhaust?

Discussion in '1982-Present GM Diesel' started by AJMBLAZER, Feb 21, 2007.

  1. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    Can someone tell me the inside and/or outside diameter of the stock dual exhaust on a 80's GM diesel or a CUCV if they're different?
     
  2. BKinzey

    BKinzey 1/2 ton status

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    2.5" and I think that's I.D.
     
  3. filo

    filo Registered Member

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    My '86 M1009 CUCV Blazer is 1 7/8" ID and 2 1/4" OD. I'm almost positive the M1009 CUCV Pickup is the same. I can verify tomorrow at work.
     
  4. 6.2Blazer

    6.2Blazer 1/2 ton status

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    My '90 with the 6.2 had 2.25" pipes from the factory.

    For the post about the pipes having 1 7/8" ID and 2 1/4" OD....man, that's some super beefy exhaust tubing! That's like 3/16" wall...heavier than any rollcage tubing you normally use.
     
  5. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    Mine seems to be 2.5" ID inlet and 2.25" ID outlet at the muffler. I found a Cherry Bomb application that should fit it exactly perfect.
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I wouldn't recomend any sort of "Glass pack" muffler...it'll eventually clog with soot.

    I'd use a chambered muffler, or something diesel specific.

    Rene
     
  7. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    I guess I don't understand how a chambered muffler wouldn't clog with soot either...other than more interior space to fill?

    I like Magnaflows but the $80 each puts me off. Still saving the pennies for one for the wife's truck.
     
  8. imiceman44

    imiceman44 1 ton status

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    The glasspacks clog very easy, the chambered mufflers will always have enough room to flow, a film of soot on the walls will not stop the flow, but soot in fiberglass will.:o
    Stick with chambered, you'll end up paying more with glass packs in no time.
    :D
     

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