Bigger exhaust stacks? Why..

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

  1. RollinThunderVet

    RollinThunderVet Medium 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.
     
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  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
     
  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.
     
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  4. "semi" retired

    "semi" retired Road Train Member

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    Pure poppycock. It's a "my stack is bigger than your stack" thing.
     
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  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.
     
    blade and Farmerbob1 Thank this.
  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.
     
    RollinThunderVet and Bean Jr. Thank this.
  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.
     
  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?
     
    TripleSix, shogun, blade and 13 others Thank this.
  9. RollinThunderVet

    RollinThunderVet Medium 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..
     
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  10. RollinThunderVet

    RollinThunderVet Medium 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?
     
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