header

What is the difference between a 4-1 or a 4-2-1 header? Is one better than the other?

The have different firing orders. The part of the header touching the motor are curved differently. Someone else should be bale to to give you more indepth info on it; cause i know very little myself. But I do know that the 4-2-1 is better.

CivicSpoon - I see you are from Syracuse, who the hell are you because I would love to come slap you upside the back of the head. They have differant "firing orders" are you friggen serious? Please explain how putting on an aftermarket header is going to CHANGE how the motor fires?

4-2-1 also known as a "stepped" design, provides for greater midrange power gains over stock - while sacrificing greater top end flow.

4-1 design, best used with motors capable of delivering higher output (higher compression, supercharged etc) has little, if not negative midrange - but a much greater upper range of power.

The numbers represent the type of header, there are 4 pipes leaving the header, since its a 4 cyl motor - thus the "4" in the begining... the "2" in the stepped design means two of those pipes come together - and then the "1" is the output on the header. A 4-1 design is just 4 tubes that converge at one exit point... pictures

4-2-1
http://www.modacar.com/Merchant2/headers_honda_files/apexi_header.jpg

4-1
http://www.modacar.com/Merchant2/headers_honda_files/dc_41_ceramic_header.jpg


See the differance... it in no way changes the way the motor fires - the header only moves exhaust gases from the head and out your exhaust. The better you are able to clear exhaust gases, the more power your car can create. You could strap on a CAI, cams, cam gears, total head rework etc. But without being able to exhaust that added pressure, the full benefits can not be seen. Modding a car is like a big puzzle - if you dont put the pieces in a certain order you can end up spending big bucks on repitition (e.g. replacing your springs, but not replacing your shocks while you are at it - since you have to remove both in order to do it... etc)

So CivicSpoon... who/where are you :devil:

thanks alot that really does help

good call sparq---and if your thinking about getting a header, i think any good tunner will tell u to get a quality header with a 2.5" collecter---jmo---as always u get what u pay for

yes now I've only proved what I've always thought; I am and idiot. I didn't mean it changes the firing order of the engine itself, I ment the order of the piping is changed. I'm going to shut my mouth from now on unless I know exactly what I'm talking about and how to explain things a lot better.
I'm just a newbie to cars; I do know quite a bit about cars now, just not as much as detailed info to make informative (or intelligent) answers. And I'm from the suburbs of Syracuse; Liverpool.
I appoligise again for my ignorant answers.

haha, I wasnt trying to be an asshole; thats just the way I am... dont take it personally, where in Liverpool - because I live in Liverpool as well. :devil:

hah liverpool. ive been to england twice and you remind me exactly of the type of people i met there. how funny. and liverpool is an awesome FOOTBALL team by the way. i have one of their jerseys. along with Arsenal and Manchester United jerseys.:D :D

Liverpool NY USA mate... not England :bandit: