4" vs. 5" exhaust

Discussion in 'Dodge 2nd Gen Cummins 5.9 (24v)' started by 1tontractor, Nov 9, 2007.

  1. 1tontractor

    1tontractor Well-Known Member

    Joined:
    Sep 26, 2007
    Messages:
    56
    Likes Received:
    0
    Location:
    San Jose, CA
    I know this is a newbie question but is there a huge difference in egt's, performance, sound between 4 and 5 inch?
     
  2. RJF's Red Cummins

    RJF's Red Cummins TRC Staff Moderator

    Joined:
    Feb 16, 2005
    Messages:
    2,877
    Media:
    68
    Albums:
    4
    Likes Received:
    0
    Location:
    I live in Modesto California
    1.There will be little to no difference in EGT's under 600HP.

    2. Performance will be about the same, some report that they feel a loss with 5", some don't. Personally, when I added my 5" system to my stock truck, I could feel a gain at the seat of my pants.

    3. Big difference in sound. 5" is much deeper and boomier than 4". The best way I have come to describe the difference is 4" sounds like a B series Cummins with a performance 4" system, 5" on a B series sounds like an N14L without a muffler.
     
  3. Sparky

    Sparky Well-Known Member

    Joined:
    Jan 11, 2007
    Messages:
    115
    Likes Received:
    0
    Location:
    Southeast Washington
    waytogo I have a 2005 dodge with the 5" monster exhaust, no difference in egt's until I was pulling a 35' stock trailer then they stayed much lower than the 4" that was on it (about 2-300* lower). The sound at idle is no different but when you put your foot in it sounds just like a freightliner, just be sure to put a muffler in otherwise you will get lots of hiway drone.
     
  4. 1tontractor

    1tontractor Well-Known Member

    Joined:
    Sep 26, 2007
    Messages:
    56
    Likes Received:
    0
    Location:
    San Jose, CA
    Thanks for the input, right now im straight pipe so it sounds like a bi-plane when im towing up hills. Getting tired of the raspy noise and high EGT's
     
  5. Dave@BD-Power

    Dave@BD-Power Well-Known Member

    Joined:
    Nov 23, 2005
    Messages:
    289
    Likes Received:
    0
    Location:
    Abbotsfordf BC
    Personally I prefer the sound of a Dual 4" kit than a 5" kit, IMO the 5" gets a bit of a drone at certain RPM
     
  6. 1tontractor

    1tontractor Well-Known Member

    Joined:
    Sep 26, 2007
    Messages:
    56
    Likes Received:
    0
    Location:
    San Jose, CA
    Got my 5" in and i love the sound, It does sound like a peterbuilt. EGT's are a bit lower but i havnt towed yet. I did feel a bit of a power increase, overall im happy with it!:pimp:
     
  7. RJF's Red Cummins

    RJF's Red Cummins TRC Staff Moderator

    Joined:
    Feb 16, 2005
    Messages:
    2,877
    Media:
    68
    Albums:
    4
    Likes Received:
    0
    Location:
    I live in Modesto California
    Sweet.... what brand?
     
  8. ram02

    ram02 Active Member

    Joined:
    Jun 2, 2007
    Messages:
    28
    Likes Received:
    0
    I just had a 4 in stainless steel Magnaflo,put on mine last week.I love the difference it made.waytogo
     
  9. 1tontractor

    1tontractor Well-Known Member

    Joined:
    Sep 26, 2007
    Messages:
    56
    Likes Received:
    0
    Location:
    San Jose, CA
    its from CMPchips, fits pretty good little tight around the crossmember but it doesnt touch.
     
  10. Woods

    Woods Well-Known Member

    Joined:
    Aug 21, 2006
    Messages:
    413
    Likes Received:
    0
    Let us know what your egts are when you get a chance to tow something.
     
  11. 1tontractor

    1tontractor Well-Known Member

    Joined:
    Sep 26, 2007
    Messages:
    56
    Likes Received:
    0
    Location:
    San Jose, CA
    will do, i have to move my rock crawler here soon so ill check it out.
     
  12. pete37922

    pete37922 Member

    Joined:
    Jan 10, 2008
    Messages:
    5
    Likes Received:
    0
    id like 2 get a 5" exaust on my 06 Powerstroke...heard the 5" on my stock engine iz not good 4 it ???
     
  13. 1tontractor

    1tontractor Well-Known Member

    Joined:
    Sep 26, 2007
    Messages:
    56
    Likes Received:
    0
    Location:
    San Jose, CA
    I dont see how it would be bad for it. Some people claim a loss of power. I guess because there isnt enough backpressure on the turbo? I definetly felt a power gain over my 3" straight pipe.
     

Share This Page