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Running straight pipes

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Mikesuburban1, Jan 31, 2017.

  1. Jan 31, 2017 #1
    Mikesuburban1

    Mikesuburban1 Bobtail Member

    43
    13
    Dec 30, 2016
    Rockland county ny
    0
    Whats the pros and cons? Do diffrent motors react diffrent?
    I have a cummins ism@425hp with egr but no dpf, im looking to straight pipe it or replace the muffler with a aero turbine 4040xl or mbrp muffler
     
    Mikesuburban1, Jan 31, 2017
    Mikesuburban1, Jan 31, 2017
    #1
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  3. Jan 31, 2017 #2
    benjamin260_6

    benjamin260_6 Medium Load Member

    433
    484
    Aug 8, 2012
    Ontario, Canada
    0
    You gain power by switching to straight pipes as long as they're not so large that they create turbulence which creates more back pressure than the original mufflers. The only soot that the mufflers would stop from going into the atmosphere is whatever gets plugged up in the baffles...causing more unwanted back pressure. As far as DPFs needing mufflers for back pressure to work right, I don't think I've ever seen a muffler on a truck with a DPF. It's my understanding that the DPF also does the work of a muffler
     
    benjamin260_6, Jan 31, 2017
    benjamin260_6, Jan 31, 2017
    #2
    Joshua Parsons Thanks this.
  4. Jan 31, 2017 #3
    Mikesuburban1

    Mikesuburban1 Bobtail Member

    43
    13
    Dec 30, 2016
    Rockland county ny
    0
    Right now it has one of those big oval mufflers under cab and its 4" in 5" out so i think my 4" mbrp straight threw muffler to the 5" inch stack shouldnt make any diffrence
     
    Mikesuburban1, Jan 31, 2017
    Mikesuburban1, Jan 31, 2017
    #3
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