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Question: JBA Headers+Exhaust (thread 3,451)

Discussion in 'Performance and Tuning' started by NoMoTaco, Mar 5, 2020.

  1. Mar 5, 2020 at 5:43 PM
    #1
    NoMoTaco

    NoMoTaco [OP] New Member

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    Hey.
    I see the 89/49 gains with long tube jba and 3” dual exhaust.

    What kind of numbers would I/we see with headers and say DD 8” single? I know lower but how much?

    thanks
     
    focal and Rex Kramer like this.
  2. Mar 5, 2020 at 6:03 PM
    #2
    Danimal86

    Danimal86 What's a Dickfir?

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  3. Mar 5, 2020 at 6:06 PM
    #3
    YotaMan

    YotaMan 5.7 MPG

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  4. Mar 5, 2020 at 6:13 PM
    #4
    NoMoTaco

    NoMoTaco [OP] New Member

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    :amen:
     
  5. Mar 5, 2020 at 9:39 PM
    #5
    Tundra_power

    Tundra_power New Member

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    But 3in dual with x pipe makes so much more power.
     
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  6. Mar 6, 2020 at 3:07 AM
    #6
    NoMoTaco

    NoMoTaco [OP] New Member

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    How much? Same dyno curve?
     
  7. Mar 6, 2020 at 3:09 AM
    #7
    Rex Kramer

    Rex Kramer Vinyl Spinner

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    Yeah, but how much more than a BAMuffler cat back with a single stock tail pipe?
     
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  8. Mar 6, 2020 at 6:46 AM
    #8
    NoMoTaco

    NoMoTaco [OP] New Member

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    In other news:
    Price quote dealer in Myrtle Beach to install headers/mid-pipe/exhaust
    $1,460.00

    Gtfoh haha
     
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  9. Mar 6, 2020 at 6:52 AM
    #9
    YotaMan

    YotaMan 5.7 MPG

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    :eek:
     
  10. Mar 6, 2020 at 8:38 AM
    #10
    Tundra_power

    Tundra_power New Member

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    You might lose 10hp at top and a bunch under the curve for torque i assume.
     
  11. Mar 6, 2020 at 9:35 AM
    #11
    NoMoTaco

    NoMoTaco [OP] New Member

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    MIGHT lose...
    A BUNCH under...
    :)

    Exactly! I can’t find any #’s to replace MIGHT and BUNCH.
     
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  12. Mar 6, 2020 at 9:42 AM
    #12
    osidepunker

    osidepunker OsidePunker

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    Have you thought about the execution?? the collector on the LT headers is 3". At what point in the system will you reduce it??
     
  13. Mar 6, 2020 at 9:44 AM
    #13
    NoMoTaco

    NoMoTaco [OP] New Member

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    Into Mid pipe I’d assume would be logical. Although assume and logical should never be in same sentence
     
  14. Mar 6, 2020 at 9:56 AM
    #14
    Tundra_power

    Tundra_power New Member

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    Ok you definitely lose torque under the curve will it make a difference yes. Do i know the exact number no.. Dirtydeeds will know though..
     
  15. Mar 6, 2020 at 10:00 AM
    #15
    osidepunker

    osidepunker OsidePunker

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    Well installing LT headers with a 3" collector and reducing to a 2.5" (or whatever it is) exhaust isn't logical so I'm not sure what you're thinking is here
     
  16. Mar 6, 2020 at 10:15 AM
    #16
    NoMoTaco

    NoMoTaco [OP] New Member

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    Thinking I don’t want duals. Thinking I don’t want warranty issues with a SC so that’s out.

    I could do a DD 8” system and maybe pick up a little TQ or...

    Thinking a happy medium may be LT headers down to a single out 8” DD. Pick up XX amount of tq yet not deal with duals towing.

    I’m thinking there Nothing wrong with considering options before opening wallet.
     
  17. Mar 6, 2020 at 10:19 AM
    #17
    osidepunker

    osidepunker OsidePunker

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    Is it the sound level you're worried about?
     
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  18. Mar 6, 2020 at 10:48 AM
    #18
    NoMoTaco

    NoMoTaco [OP] New Member

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    Sound level in day to day driving plus duals pointed at trailer for 1,000+ miles at a shot.

    I’ll be firing a call to DD soon

    Thx
     
  19. Mar 6, 2020 at 10:55 AM
    #19
    osidepunker

    osidepunker OsidePunker

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    I just went from 8" system to JBA LT headers with full 3" exhaust, 4 cats in the mid pipes, 24"x5" glass packs.

    The sound level is exactly the same. The new setup sounds much better, but sound level wise they really similar.

    This video is with windows closed:

    https://youtu.be/dVFR83CtCWc
     
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  20. Mar 7, 2020 at 11:33 AM
    #20
    NoMoTaco

    NoMoTaco [OP] New Member

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    Do you tow long distances?
     
  21. Mar 7, 2020 at 12:35 PM
    #21
    osidepunker

    osidepunker OsidePunker

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    No.

    My truck weighs 8000 lbs and it's a dedicated off road trail truck
     
  22. Mar 7, 2020 at 4:25 PM
    #22
    NoMoTaco

    NoMoTaco [OP] New Member

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    Completely different usage than myself. I know those dual you have would be brutal after a couple hours towing
     
  23. Mar 7, 2020 at 4:31 PM
    #23
    osidepunker

    osidepunker OsidePunker

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    If you say so

    I'm basically towing 2500 lbs with me everywhere I go

    Just call Keith and talk to him
     
  24. Mar 7, 2020 at 4:38 PM
    #24
    NoMoTaco

    NoMoTaco [OP] New Member

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    is the 2500 lbs a wall 4feet away from dual tips catching the exhaust noise?

    I did call. He’s never dyno’d the headers with the 8” system. Great chat-good guy. Understood my concerns with towing/duals.

    My conversation with him answered a few questions and raised a couple more.

    we shall see...
     
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  25. Mar 8, 2020 at 1:08 PM
    #25
    focal

    focal and the Warthog

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    Do the LT heads remove the cats? I’m guessing that’s where much of the power gain comes from. Thanks.
     
  26. Mar 8, 2020 at 1:18 PM
    #26
    osidepunker

    osidepunker OsidePunker

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    The power gain is made in the headers themselves. Long tubes of the correct length scavenge exhaust gasses out of the cylinder better and that's where the power increase comes from.

    You can run headers wide open and get the same power, but it would be too loud.

    The key is to build an exhaust that doesn't restrict the headers or the gasses will build up and the headers won't be able to scavenge properly.

    Cats are in the mid pipes, you can get mid pipes with or without cats. Keith claims there is no difference in power between cats or no cats because the flow is similar. He took my factory cats and cut the ends off which made the inlet /outlet 3" and used those to build a 3" catted mid pipe

    Anything less than a full 3" out of the headers will restrict flow and reduce power
     
    Last edited: Mar 8, 2020
  27. Mar 8, 2020 at 1:38 PM
    #27
    Tundra_power

    Tundra_power New Member

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    Totally agreed!!!
     
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  28. Mar 8, 2020 at 1:50 PM
    #28
    Silver4x4trd

    Silver4x4trd New Member

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    Jba long tube headers, dirty deeds TRD exhaust (2x24), 19+ Pro lights and grill painted sky silver, TRD rear sway bar, TRD reusable air filter, PnP sliders, pnp full set skid plates, 275/70/18 ko2’s, bully dog bdx (trail setting), c4 hybrid bumper with DD lights(sae fog and driving)
    I paid $700 to install headers, mid pipes and trd tail pipes. I believe Keith at dirty deeds says it about a 8 hr job
     
  29. Mar 8, 2020 at 2:13 PM
    #29
    Silver4x4trd

    Silver4x4trd New Member

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    :devil::devil::devil::devil:
    I have a very similar set up. Jba LT with with a set of cats(2 total) in mid pipes and 24x5 dirtydeeds mufflers with factory trd pipes. I tow a 5000 boat plus a lot of camping gear for about 3hrs one way and at 70 mph it not bad until it downshifts for a hill then EVERYONE around you knows you don’t have a stock truck, I love it haha
     
    YotaMan likes this.
  30. Mar 8, 2020 at 2:24 PM
    #30
    NoMoTaco

    NoMoTaco [OP] New Member

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    where?
     

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