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Changing exhaust

Discussion in 'Peterbilt Forum' started by Bdog, Dec 23, 2015.

  1. Dec 23, 2015 #1
    Bdog

    Bdog Road Train Member

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    Nov 6, 2014
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    Recently bought an 07 379. The exhaust is in good shape but I don't like it. It has the big vertical mufflers on each side right behind the doors and then the stacks barely extend up past the top of the cab and are pretty small in diameter.

    I don't want to go to anything to crazy but would like straight stacks with a muffler under the truck.

    Do I need a complete kit or can I just buy two stacks bolt them on and get a muffler shop to put a muffler underneath?
     
    Bdog, Dec 23, 2015
    Bdog, Dec 23, 2015
    #1
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  3. Dec 23, 2015 #2
    062

    062 Road Train Member

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    If your going with just one muffler,I'd get a straight thru Donaldson. You can search the forum,it's a m100463 or something like that.
    You'll need to fab up some hangers to support it.
    For the stacks,I'd go as large a diameter as you can afford. It'll keep the noise down a little.
     
    062, Dec 23, 2015
    062, Dec 23, 2015
    #2
    SAR Thanks this.
  4. Dec 23, 2015 #3
    SAR

    SAR Road Train Member

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    I agree with 062. If noise will be a concern for you, the longer the pipes the less noise there will be also, but then it gets more expensive. I probably would not reuse your current mufflers cause they most likely have a baffle in them which are very restrictive. The donaldson m100463 is a great muffler which flows good. They are around 95 bucks at ryder fleet products.
     
    SAR, Dec 23, 2015
    SAR, Dec 23, 2015
    #3
  5. Dec 23, 2015 #4
    Bdog

    Bdog Road Train Member

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    Noise isn't a concern for me. The louder the better I like the sound but I want it to be legal. I can't have anything too tall because my shop only has a 12' tall door and I like to put the truck inside to work on it at times.
     
    Bdog, Dec 23, 2015
    Bdog, Dec 23, 2015
    #4
  7. Dec 28, 2015 #5
    prerunner404

    prerunner404 Medium Load Member

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    Aug 3, 2011
    lake havasu city az
    0
    image1.JPG IMG_0270.JPG

    I just got this kit from 32 chrome. Its there peterbilt economy kit came with everything needed minus the T pipe for under the truck I bought that else where. Its the 8" kit with pickett elbows that reduce to from 8"to5" under the cab. I ran the truck for a week straight piped but the jakes were crazy loud, so i went to my local muffler shop and got a magnaflow 5" in/out high flow truck diesel muffler thats around 24" long and mounted it under the truck to help quiet things down a touch. Its still loud but now its not obnoxious when the detroit hits the jakes.
     
    prerunner404, Dec 28, 2015
    prerunner404, Dec 28, 2015
    #5
  8. Jan 15, 2016 #6
    tmslogistics

    tmslogistics Light Load Member

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    Mar 10, 2015
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    how much?
     
    tmslogistics, Jan 15, 2016
    tmslogistics, Jan 15, 2016
    #6
  9. Jan 15, 2016 #7
    prerunner404

    prerunner404 Medium Load Member

    452
    223
    Aug 3, 2011
    lake havasu city az
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    Was like 2300 for the kit I got.
     
    prerunner404, Jan 15, 2016
    prerunner404, Jan 15, 2016
    #7
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