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Bigger exhaust stacks? Why..

Discussion in 'Ask An Owner Operator' started by RollinThunderVet, Jun 16, 2019.

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  1. Jun 16, 2019 #1
    RollinThunderVet

    RollinThunderVet Heavy Load Member

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    We've all seen them.
    Pete's and KWs with 12in stacks...
    Is there ANY advantage to this or is it purely a cosmetic thing?
    My #### heat shields on my 18 w9 keep moving and contacting the cab. I've had 2 dealers attempt to lock it in place.
    So if I wanted to just put new stacks and no shield on what would it do?
    Does the larger pipe disperse heat better?
    I dont care about sound, and I know it wont do anything for performance.
     
    RollinThunderVet, Jun 16, 2019
    RollinThunderVet, Jun 16, 2019
    #1
    Farmerbob1 Thanks this.
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  3. Jun 16, 2019 #2
    starmac

    starmac Road Train Member

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    They are mainly their to see how much weight the cab can stand before they tear loose.lol
     
    starmac, Jun 16, 2019
    starmac, Jun 16, 2019
    #2
    D.Tibbitt, rabbiporkchop, speedyk and 9 others Thank this.
  4. Jun 16, 2019 #3
    Midwest Trucker

    Midwest Trucker Road Train Member

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    They’re for rollin more coal! In today’s choked down engine environment I’m not sure that they would do much if anything but look cool.
     
    Midwest Trucker, Jun 16, 2019
    Midwest Trucker, Jun 16, 2019
    #3
    blade, Bakerman, bzinger and 2 others Thank this.
  5. Jun 16, 2019 #4
    201

    201 Road Train Member

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    high plains colorado
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    Pure poppycock. It's a "my stack is bigger than your stack" thing.
     
    201, Jun 16, 2019
    201, Jun 16, 2019
    #4
    Bakerman, Tb0n3, bzinger and 5 others Thank this.
  7. Jun 16, 2019 #5
    Intothesunset

    Intothesunset Road Train Member

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    I doubt big stacks would give any real sound to an scr engine.
    Unless it was thrown away than straight piped?
    I can wish.
     
    Intothesunset, Jun 16, 2019
    Intothesunset, Jun 16, 2019
    #5
    blade and Farmerbob1 Thank this.
  8. Jun 16, 2019 #6
    Rubber duck kw

    Rubber duck kw Road Train Member

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    Purely looks on an emmissions engine, on a good straight piped nothing after the turbo engine it takes some of the harsh note out and gives you more of a low beller, that's what I've been told anyway, never drove anything with bigger than 5 inch straights so I dont know.
     
    Rubber duck kw, Jun 16, 2019
    Rubber duck kw, Jun 16, 2019
    #6
    RollinThunderVet and Bean Jr. Thank this.
  9. Jun 17, 2019 #7
    starmac

    starmac Road Train Member

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    Think about it, One 5 inch pipe leaving the turbo, split to two 5 inch pipes that can handle twice as much as can get to them. lol
    I read a study years ago that if you have mufflers the engine needs twin stacks to breathe, straight stack would breath fine with a single stack. I take no chances, so I have twin straights on my truck. lol
    My international though is a muffled single stack kind of deal, them detroits don't need no two stacks. lol
    I do like the looks of 6 in pipes, or even 7 in tips on some trucks, I don't like the looks of 8 in pipes, but that is just my preference.
     
    starmac, Jun 17, 2019
    starmac, Jun 17, 2019
    #7
  10. Jun 17, 2019 #8
    blairandgretchen

    blairandgretchen Road Train Member

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    Just admit - repeat after me.

    THEY . . . LOOK. . . . AWESOME.

    There. Wasn't so hard - was it?
     
    blairandgretchen, Jun 17, 2019
    blairandgretchen, Jun 17, 2019
    #8
    TripleSix, shogun, blade and 13 others Thank this.
  11. Jun 17, 2019 #9
    RollinThunderVet

    RollinThunderVet Heavy Load Member

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    I'm not a chrome guy. After a day of work, the last thing I wanna do is get out and clean chrome. My tool boxes, tanks, rack, and APU are all brushed/satin looking.
    Personally I think anything over twin 6s looks like trash. Kinda like the f250s with a 12in tip that's only 18" long. It screams I have a 5ft shifter, and I always redline my harley after I start it, just to make sure its on..
     
    RollinThunderVet, Jun 17, 2019
    RollinThunderVet, Jun 17, 2019
    #9
    S M D, D.Tibbitt, Tb0n3 and 5 others Thank this.
  12. Jun 17, 2019 #10
    RollinThunderVet

    RollinThunderVet Heavy Load Member

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    That's what I figured. The only reason I would consider increasing size would be if it dissipated heat quicker than the stock 5s. That way I could just trash the heat shields.
    Anyone ever use exhaust wrap on semis?
     
    RollinThunderVet, Jun 17, 2019
    RollinThunderVet, Jun 17, 2019
    #10
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