1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

4-1 header or 4-2-1 header?

Discussion in 'Engine Building' started by mrnice1058, Sep 5, 2004.

which would you get 4-1 or 4-2-1 header?

  1. 4-1 header

    100.0%
  2. 4-2-1 hea

    0 vote(s)
    0.0%
  1. mrnice1058

    mrnice1058 Senior Member

    Messages:
    483
    Likes Received:
    0
    Joined:
    Feb 11, 2004
    Location:
    Pa
    tell me why you chose what you chose i need to know which is better for my b16 engine thanks guys
     
  2. jamesA

    jamesA Well known pissed off telephone guy VIP

    Messages:
    16,129
    Likes Received:
    1,020
    Joined:
    Aug 10, 2003
    everyone recommends the jdm itr 4-1 header. I believe they say it's because you gain more power at the top of the rpm range, where the B16 already shines anyway.

    i'm tires so if i mess this up then sorry, but I think as i said 4-1 header gains power in the higher rpm band where as a 4.2.1 gains torque in the midrange which would be better for a b18c1.
     
  3. xj0hnx

    xj0hnx I wanna be sedated VIP

    Messages:
    14,172
    Likes Received:
    48
    Joined:
    Nov 10, 2002
    Location:
    C.C.TX.
    That's the general consensus.
     
  4. brian11to1

    brian11to1 Senior Member

    Messages:
    9,203
    Likes Received:
    21
    Joined:
    Jan 9, 2003
  5. asmallsol

    asmallsol Super Moderator

    Messages:
    8,074
    Likes Received:
    3
    Joined:
    Sep 28, 2002
    Location:
    Houghton/Livonia Michigan
    The JDM ITR header is a alright header, but it is far from being great. One, its not a 2.5inch collector. Gains are not even that big. There are other brands of headers for the same price that offer bigger gains. Hell even the POS brand DC sport "JDM 2.5 inch" header makes bigger gains then the JDM ITR. There are also brands out there that make exact replicas of high end off the shelf headers like spoon, and mugen for around 300, plus they don't rust like the JDM ITR one does. Only plus about it that I see is you can buy the fastline Skid plate for the ITR header and according to E, it works great.
     
  6. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

    Messages:
    9,623
    Likes Received:
    345
    Joined:
    Nov 13, 2002
    Location:
    MD
    you also gotta think about clearance. you EG/sol guys dont have to worry about clearance. theres almost enough space for you to stand in there with an engine already in there, lol. its a big issue for us EF/ED guys. the jdm typr r header fits the closest to the motor, and has the best ground clearance of any 4-1 header (minus the an-r and bisimoto headers and such). and the skid plate is a big plus too :) my .02
     
  7. jamesA

    jamesA Well known pissed off telephone guy VIP

    Messages:
    16,129
    Likes Received:
    1,020
    Joined:
    Aug 10, 2003


    Well how is that comparison fair to the jdm itr, since it's nothing more than a stock 4-1 piece. Comparing stock to aftermarket seems kind of pointless when you call the aftermarket piece a POS in your arguement.

    What is the collector on the jdm itr? I thought it was a 2.5"?
     
  8. civicious

    civicious FüK-VTEC VIP

    Messages:
    9,855
    Likes Received:
    629
    Joined:
    Jun 15, 2003
    Location:
    Houston, TX
    jdm = 2.5
    usdm = 2.25
     
  9. brian11to1

    brian11to1 Senior Member

    Messages:
    9,203
    Likes Received:
    21
    Joined:
    Jan 9, 2003
    I went with the JDM ITR becuase...

    I only paid 150 for it... not to mention its painted black... so it wont rust...
     
  10. B16

    B16 Super Moderator VIP

    Messages:
    11,539
    Likes Received:
    534
    Joined:
    Sep 30, 2002
    Location:
    yay area, CA

    if its nothing more than a stock piece, why did you recommend it in the first place then? its overpriced and overrated. asmallsol is correct, the jdm dc makes better power than the oem one, and has a true 2.5" collector. the collector on the jdm itr is more like 2.25" with a 2.5" doughnut, but the collector is not really a 2.5" as where the dc one is. i have the dc jdm 4-1 and yes it is a piece of shit, when you compare it to other headers out there in the industry.

    i chose 4-1; but there are quite a few 4-2-1 custom headers out there that kick ass also, those with long runners.
     
  11. jamesA

    jamesA Well known pissed off telephone guy VIP

    Messages:
    16,129
    Likes Received:
    1,020
    Joined:
    Aug 10, 2003
    I recommended it as a stock piece, I never recommended it as the best ever 4-1 header. However, 3 or 4 months ago when I asked this very same question, none of this discussion was never brought up. All anyone ever said was "just get hte jdm itr 4-1 header from hmo.com" and that was that.
     
  12. B16

    B16 Super Moderator VIP

    Messages:
    11,539
    Likes Received:
    534
    Joined:
    Sep 30, 2002
    Location:
    yay area, CA
    cool dude :thumbsup:
     
  13. mrnice1058

    mrnice1058 Senior Member

    Messages:
    483
    Likes Received:
    0
    Joined:
    Feb 11, 2004
    Location:
    Pa
    thanks for all your help but here is the think i was talking about my car the other day and this kid was saying there is no way in hell that a b16 with 111 ft tq is going to ever beat his sentra spec v so i was wondering if i get a 4-2-1 header like the one that dc makes would i gain a noticable amount of torque or am i better getting the high end power with a 4-1 because i have a jdm header because i got mine from japan(from my cousin in the military stationed in japan) and it has japanense writing on it so you think i should stick with the one i have or go with a say dc(or dc clone) header 4-2-1 for more torque or shine at the top end thanks guys
     
  14. jamesA

    jamesA Well known pissed off telephone guy VIP

    Messages:
    16,129
    Likes Received:
    1,020
    Joined:
    Aug 10, 2003
    The Sentra Spec V is just as quick as an 00 Si. It has less torque, correct, but it also has less weight than the V, and a nice long powerband which is something the V doesn't have either.

    Edit: btw b16 thanks for hte headsup here on what would be a better power per dollar deal for him, I'll keep this in mind next time someone asks the same question... in about 3 days from now. :p
     
  15. mrnice1058

    mrnice1058 Senior Member

    Messages:
    483
    Likes Received:
    0
    Joined:
    Feb 11, 2004
    Location:
    Pa
    so you telling me that with my b16 i will be able to take him on? by the way i think i am a good driver because on my d16 i was able to get 15.89 and i was close to him the whole way
     
  16. KloggMonkey

    KloggMonkey Member

    Messages:
    92
    Likes Received:
    0
    Joined:
    Jun 27, 2004
    Location:
    KS
    Specs of the 98 spec ITR 4-1 headers

    donut gasket: .5 inch of gasket all around the pipe
    pipe diameter in the center 2.33 inches (60mm)
    Total diameter of entire gasket and pipe assembly 3.33 inches

    They lie about the 2.5" Everything as far as exhaust on the CTR or ITR is all 60mm

    And yep they rust like a biotch ... my dipstick even has rust on it...

    but they are nice and would never get rid of them
     
  17. jamesA

    jamesA Well known pissed off telephone guy VIP

    Messages:
    16,129
    Likes Received:
    1,020
    Joined:
    Aug 10, 2003


    next time put oil in your car before you drive it then :thumbsup:

    :p
     
  18. mrnice1058

    mrnice1058 Senior Member

    Messages:
    483
    Likes Received:
    0
    Joined:
    Feb 11, 2004
    Location:
    Pa
  19. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    54
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home


    bah, tbone has an itr set up in his crx, and has run just about every header on the market- including SMSP and all ther other stupid large headers.

    theres room.

    but yes, 4-1 is the way to go IMO. its where hondas make their power anyway
     
  20. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

    Messages:
    9,623
    Likes Received:
    345
    Joined:
    Nov 13, 2002
    Location:
    MD
    what front crossmemnber is he running? stock or jimfab wont provide enough room. if its all hacked to hell or running the very nice full-race bar then id believe it. im gonna get the full-race bar when i get the cash. its the best crosmember out there right now. supposed to be the strongest and gives a lot of needed clearance for the EF/ED guys
     
Verification:
Draft saved Draft deleted

Share This Page