Of course am looking to get a header but what is the diffrent between 4-2-1 and 4-1 and which is better?

 

in most mainstream headers, DC sports etc a 4-2-1 is designed to give better midrange punch and a 4-1 is supposed to flow better on the top end

but you can configure either design to have either powerband characteristic

 

depends on what you are looking for a 4-2-1 header will give you good bottom end power but not top and the 4-1 is the opposite. You still get decent bottom end on a 4-1 depending on what else you have done to your engine but has a better top end.

 

Like the two said earlier, 4-2-1 is good for mid-range power while a 4-1 seems to find horsepower much higher in the rev-band. It all depends on your style of driving... If you like to spend all day near redline, then you'll probably benefit from a 4 to 1... If you drive on the street and are sick of not having "enough" power in the midrange, then 4-2-1 is probably better for you.

 

guys.....

where the best gains are delivered in a header are dependant on alot more things than just how the merges are designed! i just said that lol

its an incorrect stereotype that all 4-2-1 headers are better in the midrange than a 4-1

you can build a 4-2-1 to out perform a 4-1 on the top end and u can build a 4-1 to outperform a 4-2-1 in the midrange

you need to look at the specs, the primary lengths and size etc etc etc

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nick M &raquo;</TD></TR><TR><TD CLASS="quote">guys.....

where the best gains are delivered in a header are dependant on alot more things than just how the merges are designed! i just said that lol

its an incorrect stereotype that all 4-2-1 headers are better in the midrange than a 4-1

you can build a 4-2-1 to out perform a 4-1 on the top end and u can build a 4-1 to outperform a 4-2-1 in the midrange

you need to look at the specs, the primary lengths and size etc etc etc

</TD></TR></TABLE>

exactly............... the long and short of it is that design creates power

 

I was just basing it off them by themselves. There are a lot of factors that you have to look at but if you have the same manufacturer with the 2 different types of headers those are the results you will get

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by btlfed1 &raquo;</TD></TR><TR><TD CLASS="quote">depends on what you are looking for a 4-2-1 header will give you good bottom end power but not top and the 4-1 is the opposite. You still get decent bottom end on a 4-1 depending on what else you have done to your engine but has a better top end.</TD></TR></TABLE>

there is no such thing as making power in the low end with any engine, nevermind a 4cyl

to make big horsepower requires lots of air, whether that is from NA high revving or forcing it in with a turbo or sc

 

also remember things like heat, flow, and deflection

teh faster the exhaust flows the better, the smoother the transition from 2 to 4 pipes or 4 to 1 pipes is the hotter the exhaust stays and the better it flows meaning less resistance to the enigine

if I could have an online class about this it would make much more sense

if you can smooth out the exhaust floww and make the transition as smooth as possible header design is relative to the application

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nick M &raquo;</TD></TR><TR><TD CLASS="quote">to make big horsepower requires lots of air, whether that is from NA high revving or forcing it in with a turbo or sc</TD></TR></TABLE>
Lots of air of fast flowing air. If the piping is too big, the exhaust gases won't flow right and, if I'm not misunderstood, more backpressure.
Excessive backpressure=

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sleeping4drLS &raquo;</TD></TR><TR><TD CLASS="quote">
Lots of air of fast flowing air. If the piping is too big, the exhaust gases won't flow right and, if I'm not misunderstood, more backpressure.
Excessive backpressure= </TD></TR></TABLE>

 

excessive back pressure is bad for both cars and humans...

 

i find my 4-2-1 ractive header yes i have a ractive header it was cheap and better then pace setter so **** on a stick :D anyways i find that the ractive 4-2-1 for 4th gen accords give a great Top end more then anything but they definately gave me sort of an all around power but mostly its noticeable in the topend