I am about to buy a header for my car......I was wondering what the differences, if any, are there in performance between the 4:1 and 4:2:1 header? Also wondering who makes the best header for say.........a 1/4 mile? appreciate it

 

https://honda-tech.com/zerosearch

 

4-1 is a header that has 4 runners that connect into 1 collector at the bottom (better for top end)

4-2-1 has 4 runners that collect into 2 runner than those 2 convert into 1 at the bottom... a little better for torque.

At least thats what I have been told... someone will surely correct me if i'm wrong

 

I know how they run but what i am asking is is there any real difference in performance from them

 

4-1



4-2-1

 

nevermind about that last thing I just said............I can't read

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Toda Built &raquo;</TD></TR><TR><TD CLASS="quote">4-1 is a header that has 4 runners that connect into 1 collector at the bottom (better for top end)

4-2-1 has 4 runners that collect into 2 runner than those 2 convert into 1 at the bottom... a little better for torque.

At least thats what I have been told... someone will surely correct me if i'm wrong</TD></TR></TABLE>

Not always the case. What really determines powerband location in a header is the length and diameter of the primaries/secondaries and the collector. There are headers (Hytech makes one) that combine the 4-2-1 layout with the typical 4-1 tube/collector "styles" to get high end power without the clearance problems of a 4-1. For your average low price headers what you said holds true, but the reason you can get away with saying that isn't because a header is 4-1 or 4-2-1. Sorry that was a little confusing?

 

now ur just confusing everyone

 

No that wasn't confusing at all Molecular. You explained it the way I would.