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exaust advice. does this sond like a good setup?*UPDATE*

Discussion in '1982-Present GM Diesel' started by ducttape114, Apr 27, 2003.

  1. ducttape114

    ducttape114 1/2 ton status

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    <font color="red"> i went and talked to the muffler guy today. he said duel 3" routed around 2 t-cases as high as possible all the way to the bumper would be $400ish, depending on what mufflers i wanted. he was telling me the borla was the was to go as it had almost NO backpresure and it was pretty quite. any thoughts now? last moment advice? thanks again





    </font> 6.5L non-turbo. im thinking duel 4" with glass packs. this would offer a very low amount of back pressure and still not be real loud right? but what do i do about manifolds? i have never seen headers for our trucks but i would guess the manifolds are not as free flowing as headers right? in a perfect world my truck would have about 1 or 2 pounds of backpressure and run just loud enough i could hear/feel that she was running. but i will sacrifice silence in the name of power. ok hope that made sense. thanks in advace
     
  2. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Re: exaust advice. does this sond like a good setup?

    Dual 4" is probably an overkill, it seams that dual 3"s are the going size. www.kennedydiesel.com sells header kits for the 6.2/6.5. With dual 3s and glasspacks your exhaust setup will be optimal.
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: exaust advice. does this sond like a good setup?

    Don't glasspacks get plugged up with soot on a diesel? I'd run Flow masters before I'd run glasspacks...

    Rene
     
  4. ducttape114

    ducttape114 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    cool man!! my thinking was that if 3" is good 4" is better right? the pipe is not THAT much more, the labor is the expensive part. i might have trouble finding glasspacks with 4" input/output though.

    anyone have any experiance with glass packs on a diesel? how loud are they?
     
  5. BlueBlazer

    BlueBlazer 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    Anything bigger than 2.5 in would be worthless due to the outlet of the manifolds being either 2.25 or 2.5 (cant remember which one exactly). If I was willing to spend money on custom exhaust, I would Y the pipes into a single 3" or dual 2.5" with a balance pipe. Anything bigger would be a waste of money.
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Re: exaust advice. does this sond like a good setup?

    IIRC the outlet size is 2.25" stock, but that can be opened up to 2.5".

    Rene
     
  7. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Re: exaust advice. does this sond like a good setup?

    Although that would be a restriction, exhaust running 15 feet will flow better through a 3" than a 2.5" after exiting the manifold.
     
  8. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Re: exaust advice. does this sond like a good setup?

    If anything gets plugged it would be the baffles, then it would simply be a straight through pipe.
     
  9. BlueBlazer

    BlueBlazer 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    I dont believe that is true, but I cant say I am an expert at the characteristics of exhaust flow in pipes so I really cant make a good argument. But I know for sure the gain would be very minimal and probably only felt at high rpms which to me wouldnt make it worth the extra cost.
     
  10. ducttape114

    ducttape114 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    you are talking about the manifold outlet right? what is the size of the actually exuast port? if i ran headers then i would not need to worry about the stock manifolds outlet.
     
  11. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Re: exaust advice. does this sond like a good setup?

    I agree it is probably a very slight improvment.
     
  12. BlueBlazer

    BlueBlazer 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    Dont waste your money on headers, please, for your own sake!
     
  13. Paxx

    Paxx 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    I'm with rene and I vote against the glasspacks. I've heard that they don't even sound great with a diesel. I say go with Gibson exhaust 3" single pipe. /forums/images/graemlins/thumb.gif
     
  14. Paxx

    Paxx 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    Oh yeah, and definitly skip the headers as well. I read an article about it today, said something about gains being almost non-existent. They recomend if your using anything use the 6.5L's or late model 6.2's as they flow slightly better than the early model ones. But even those won't be very noticable.
     
  15. ducttape114

    ducttape114 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    ok, so the new and improved plan is single 3" with a flowmaster and open the manifold to 2.5" does anybody have info on how to open them up? do i just dremel the hole bigger or what?
     
  16. imiceman44

    imiceman44 1 ton status

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    Re: exaust advice. does this sond like a good setup?

    [ QUOTE ]
    I'm with rene and I vote against the glasspacks. I've heard that they don't even sound great with a diesel. I say go with Gibson exhaust 3" single pipe. /forums/images/graemlins/thumb.gif

    [/ QUOTE ]

    Glass packs that are made for gas engines are no good with diesel.
    Where I came from they made glasspacks for diesels, basically the hiles inside are bigger so they don't clog that easy, and they sound awesome.
    /forums/images/graemlins/thumb.gif
     
  17. Paxx

    Paxx 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    /forums/images/graemlins/grin.gif lol where did you come from? /forums/images/graemlins/rotfl.gif
     
  18. Tybee

    Tybee 1/2 ton status

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    Re: exaust advice. does this sond like a good setup?

    [ QUOTE ]
    /forums/images/graemlins/grin.gif lol where did you come from? /forums/images/graemlins/rotfl.gif

    [/ QUOTE ] /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif A planet far far away!! /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
     
  19. 86DIESEL

    86DIESEL Registered Member

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    Re: exaust advice. does this sond like a good setup?

    I have run 2.5" 40 series flowmasters on my stock dual pipes for several years now. I think the baffles and chambers collect particulate matter and the mufflers start to lose some of the flow and performace that they had when they where new. Although the setup i have now is alot better than the stock mufflers that were on the truck when i bought it even if they have lost some of their flow.
     
  20. imiceman44

    imiceman44 1 ton status

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    Re: exaust advice. does this sond like a good setup?

    [ QUOTE ]
    /forums/images/graemlins/grin.gif lol where did you come from? /forums/images/graemlins/rotfl.gif

    [/ QUOTE ]

    Well I forgot I removed that from my profile a while ago.
    I grew up in the middle east and some in europe.
    For you guys yes a planet far far away.
    /forums/images/graemlins/thumb.gif
     

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