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1971 CJ5 exhaust question

Discussion in 'Early CJ5 and CJ6 Tech' started by theBBQman, Sep 25, 2008.

  1. Sep 25, 2008
    theBBQman

    theBBQman theBBQman

    Littleton, CO
    Joined:
    Sep 9, 2008
    Messages:
    35
    My '71 CJ5 has some neat headers on it to some crappy looking flexible exhaust piping that runs right along the rear tire and out the back. It looks WAY too close to the tire for me. What can I do to fix it? Someone suggested I put it out the sides behind the doors, but I'm afraid that may make it very loud. Is it worth the trouble of re-running the exhaust more carefully out the back? The corrugated pipe looks like it would kill the air flow, too... kind of defeats the purpose of the headers...

    Any ideas?

    Thanks,
    Jay
    View attachment 23905

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    theBBQman, Sep 25, 2008
    #1
  2. Sep 25, 2008
    $ sink

    $ sink Gazillians of posts

    Virginia Bch
    Joined:
    Nov 25, 2004
    Messages:
    1,373
    well, I have about the same setup back to the mufflers then they are turned out right in front of the back tires. not all that loud.
     
    $ sink, Sep 25, 2008
    #2
  3. Sep 25, 2008
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    I don't think you have a lot of options with fenderwell headers. If the mufflers were inside the frame, you could bring the pipes back and over the axle, and out the rear corners. With these headers, the pipes are already outside the frame. I think dumping the exhaust just ahead of the rear tires is the only realistic choice.

    Noise will depend a lot on the mufflers you choose. That you have some control over. A good muffler shop should be able to fix you right up with mufflers and pipes - ask for a quiet muffler.
     
    timgr, Sep 25, 2008
    #3
  4. Sep 25, 2008
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
    Messages:
    9,221
    Supertraps are rather small and can be tuned to be quiet.
     
    sparky, Sep 25, 2008
    #4
  5. Sep 26, 2008
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,559
    from the headers back looks home brew to me and it is too close in my opinion.

    a good muffler shop can make the 90* bends that will go up and over the shock mount and run along the tub to exit the rear corners; that's always been the hardest part, those two tight bends needed.
     
    jpflat2a, Sep 26, 2008
    #5
  6. Sep 26, 2008
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
    Joined:
    Sep 22, 2002
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    8,360
    X2, it can be done...
     
    Patrick, Sep 26, 2008
    #6
  7. Sep 26, 2008
    matthew johnson

    matthew johnson Major League Infidel

    northern california
    Joined:
    Feb 11, 2008
    Messages:
    140
    The way your muffler is attached is killing your flow more than the tail pipe. It should slip OVER the collector, not inside.
     
    matthew johnson, Sep 26, 2008
    #7
  8. Sep 26, 2008
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    I always hated those crappy gaskets on the collector flange... paper, even the metal-faced ones don't hold up. I eventually replaced that with Header Buddys... no more gasket problems.
    http://www.headerbuddy.com/

    I also installed 90* turn outs behind the muffler to exit in front of the back tire on my old '71. Not too loud; muffler choice makes the difference.
     
    lynn, Sep 26, 2008
    #8
  9. Sep 26, 2008
    jeep67

    jeep67 Member

    Shasta, Ca
    Joined:
    Dec 11, 2006
    Messages:
    205
    x3! My exhaust pipes huge the body up and over the shock mount and then dive down and parallel the frame to exit out the back. I can provide photos if you like. I have had no problem and can easily run tire chains without issue. I must mention, however, I do run 1.25" spacers in the rear to match the width of the front D30 and to keep my tires from rubing the inner wheelwell.
     
    jeep67, Sep 26, 2008
    #9
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