I'm just wondering whats better... a 4-2-1 style header or a 4-1 style header. thx

 

Honestly, there is more to a header then a 4-2-1 or 4-1. With todays better header manufacturers (SMSP, RMF, Hytech, etc) you can get a 4-2-1 with some characteristics of a 4-1 and vice versa. Depending upon: tubing sizing, collector length, "stepped" design, "reversion", and sequentially and non-sequentially paired primaries.

To get a better understanding about headers read this link;
http://www.team-integra.net/se...ID=50
http://www.team-integra.net/se...eID=2

Ali

 

4-2-1 for non vtec 4-1 for vtec IMO

 

4-1 will bottem out easier...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cm zak &raquo;</TD></TR><TR><TD CLASS="quote">4-1 will bottem out easier...</TD></TR></TABLE>

Not neccisarily, it usually depends on the design. Tri-Y config or box collector. Usually a box style collector usually is bigger in width/height therefore causing it to more likely bottom out.

Ali

 

I belive the mag is called "Turbo" or something like that ( in the mag section of Walmart, no comments please ) and they do a test on the following headers:
Dc Sports 4-2-1
DC sports 4-1
ITR
... I forget the other (wow, how helpful am I???)

Anyway, they have the dyno's of all of them and the DC sports 4-1 was the best out of the other 3, as far as low-mid power and was only 1 hp behind the leader (DC 4-2-1) for the highest hp.

BUT, it all depends on your application and what you're looking for.
Do you want more high end hp or more low-mid hp and torque?Remember, evry engine is different and your engine package may have diff. needs as far as the header than someone elses.

The test, BTW, was on a b18c5 w/headwork, 173 hp 110 tq

 

i could be wrong by saying this, but im pretty sure 4-2-1 is for mid range power, and 4-1 is for top end power...