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Which Exhaust Manifold to get??

Discussion in 'Civic and del Sol - EG and EK' started by danwilliams, Jan 12, 2007.

  1. danwilliams

    danwilliams New Member

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    Ok so Im looking at manifolds for my soon to be B16 powered Coupe and im torn between two its either a 4-2-1 or a 4-1 design any sugestions on which one would produce the most power?
     
  2. AHHVTEC

    AHHVTEC Well-Known Member VIP

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    4.2.1 is for bottom end power 4.1 is for top end power
     
  3. danwilliams

    danwilliams New Member

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    Ok so Im after faster acceleration so 4-2-1 sounds best to me ive got a choice between 2 designs

    [​IMG]
    this 1 piece design


    [​IMG]
    Or a two piece design

    would having the 2 piece version hanker performance Im thinking the 1 piece would be the best but I just want a second opinion. cheers
     
  4. AHHVTEC

    AHHVTEC Well-Known Member VIP

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    i like the top one
     
  5. 801CRX

    801CRX Got Rice?

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    I personally would go with the 4-1, 1 piece header. The less air flow restriction the better. looks like the 2 piece flange would create just a little restriction.
     
  6. Seany-izzle

    Seany-izzle New Member

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    the difference between the two is so small, you wont even notice. Youll maybe see, at MAX, a peak hp difference of 4hp. But thats peak, it could do shit under 6k rpms. Look around on different honda sites (honda-tech, clubcivic.com, etc) and search for header dyno charts. hell, just type it into google. You could actually get better usable gains from a 4-2-1 since i doubt you drive your car at 5-6k rpm's all day...

    The difference in acceleration will be negligible. Dont worry about the restriction, because well... its minimal, so minimal that it wont make a difference for the average joe. Now, if you were building a motor, doing headwork, and were going for something more than just another b16 with bolt ons... then you might wanna start to care.
     
  7. danwilliams

    danwilliams New Member

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    Thanks guys I think im gonna go for the 4-2-1 single piece youve all been a great help!!
     
  8. hcivic.com

    hcivic.com Senior Member

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    go for the two piece, installing 1 piece are a pain in the ass
     
  9. bitchasscracker

    bitchasscracker Banned

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    i rock a stock gsr one works good i think
     
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