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

4-2-1ls header to Skunk2 Mega Power R Exhaust System

Discussion in 'Civic and del Sol - EG and EK' started by shahzzy, Nov 4, 2008.

  1. shahzzy

    shahzzy noob

    Messages:
    116
    Likes Received:
    3
    Joined:
    Jul 8, 2008
    I just bought a greddy header for my LS swap, but will that bolt right up to the civic Skunk2 Mega Power R Exhaust System (for my 1994 civic eg)?

    Do I need to make any modifications?
     
    Last edited: Nov 4, 2008
  2. shahzzy

    shahzzy noob

    Messages:
    116
    Likes Received:
    3
    Joined:
    Jul 8, 2008
    I mean to say, will the following just bolt up?
    b18 header 4-2-1 onto the 1994 civic hi flowcat onto the ckunk 2 exhaust?
     
  3. redxcobrax

    redxcobrax God member

    Messages:
    92
    Likes Received:
    4
    Joined:
    Nov 5, 2008
    Location:
    Kenosha, WI
    Well, it depends on the outlet of the header you purchased. For example if your 4-2-1 header outlets diameter is 2.25 inches, you need your cat or testube or what ever you plan on using, to have an inlet of 2.25 inches and an outlet of whatever you'd like. Then the cat back exhaust needs to have an inlet size diameter = to the outlet size of the cat.
    Correct me if I am wrong.
     
  4. frodotoolbox

    frodotoolbox 92 civic si d15b

    Messages:
    371
    Likes Received:
    1
    Joined:
    Aug 1, 2007
    Location:
    sc
    exactly.
    but if its a stock sized header and a stock size cat yet it will bolt up.
     
  5. dales94EJ1

    dales94EJ1 Speed Freak

    Messages:
    26
    Likes Received:
    0
    Joined:
    Oct 30, 2008
    Location:
    Boise, ID
    Uh, yeah. They should bolt right up. The size of the tube won't make a difference when bolting them together. It'll only make a difference in the way each component reacts. And the output of the header has a tapered doughnut gasket that will mate with an OEM or aftermarket cat.

    Try to keep all the whole exhaust system the same size to eliminate any constrictions to air flow caused by a smaller diameter component. The smallest diameter tubing you have is your focus point for flow. If you have a 2.25" cat and a 1.5" cat-back then you're only running a 1.5" exhaust. Having the larger in/out ports for the cat really isn't doing anything but causing the air flow to back up at the output flange which causes more back pressure. Think of it like a water hose, the smaller the hose the less water goes through. In order to get the same amount of water to go through as the big hose you have to apply more pressure. In an exhaust system, you want to reduce the pressure so the motor does not work as hard to expel the spent gases from the combustion cycle. Make sense?
     
    Last edited: Nov 10, 2008
  6. frodotoolbox

    frodotoolbox 92 civic si d15b

    Messages:
    371
    Likes Received:
    1
    Joined:
    Aug 1, 2007
    Location:
    sc
    you cant bolt up a 2" pipe to a 3" pipe the bolt parttern is completely different. thats what i was talking about.
     
Verification:
Draft saved Draft deleted

Share This Page