2kstreetcivic

alright, so I know that 4-2-1 header increases power throught the power band, while 4-1 header is suppose to increase the power at the top of the rpm band...my question is, which is better for a d16y8.....is there really that big of a difference???...thanks

civictildeath

it depends on which you are looking for. low and mid or mid to high range power

JDM EG Hatch

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civictildeath &raquo;</TD></TR><TR><TD CLASS="quote">it depends on which you are looking for. low and mid or mid to high range power</TD></TR></TABLE>

bob barker

i have a dc 4-1 header. i like it, but i have never had a 4-2-1. i would buy one that best suits your cars aftermarket parts.(if that makes any sense)

2kstreetcivic

well which can you get more gains out of....mid to high or low to mid...because hondas dont have tons of torque, so wouldnt you get more mid to high gains because it would be hp gain where low to mid would torque gain??

civictildeath

well it depends on how you drive and what you want from it again.

me driving- usually never drop below 4000 rpm's so i would want hi end gains.

other drivers- usually use low rpm's so they would want low end gains

see what we are saying??

b 1 6 a 2

is that so..

rafael_dias

if you have a vtec engine and your looking to add cams or something, i would suggest 4-1 headers, but for everyday drive ability i would recommend 4-2-1 headers. also many say that vtec kicks in during high rpm so the 4-1 would be ideal.

b 1 6 a 2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ctch22 &raquo;</TD></TR><TR><TD CLASS="quote">if you have a vtec engine and your looking to add cams or something, i would suggest 4-1 headers, but for everyday drive ability i would recommend 4-2-1 headers. also many say that vtec kicks in during high rpm so the 4-1 would be ideal.
</TD></TR></TABLE>

What difference does it make for the vtec to kick in if you chose 4-1 or 4-2-1? Its not like it will engage anytime earlier if you chose the 4-2-1 route.

2kstreetcivic

whats the difference between 1 peice and 1 piece..I OBVIOUSLY know that they come in 1 or 2 pieces..but is one better than 2 or visaversa?..and whY???

b 1 6 a 2

The one piece will have a lower chance of having a leaky header, but, its a tad harder to install since its one bulky piece.

The 2 piece has a higher chance of having leaks where the lower pipe meets the upper half, but, its easier to install since you can do the upper half first, then finish the lower part.

Unless there is a better reason for a 2 piece design, lets hear it.

Ek9ReVciVic

i ran the the 4-2-1 on my d series motor before w/ a high flo cat

2kstreetcivic

so there is no performance loss of a 2 piece?...and how likely is a Leaky Header??..and what does that mean?..power lose?

jlacoy82

2-pieces weigh more. And by leaky header he basically means its one more joint to leak from, because you have a gasket that goes between the upper and lower header pieces and gets crushed in when you bolt it together.

While your at is, bring up primary/secondary/collector lengths, and what advantages/disadvantages there are to those and also stepping the primaries.

I'm in the market for a header too in the 300-500 dollar range, and I'm going with a fully rebuilt port and polished head and mildly large cams, and want to get my "GIT UP AND GO" in mid/high, not to threadjack, but what are some options?

I know they have an "official header thread" (I think), but would be great if someone did all the research and came up with a faq on headers where it basically said "XXX header is going to give you best gains from X rpm to X rpm, and you'll lose X torque at X rpm, and gain X @ X" so basically you could say, "OK, I want to make all my gains in the lower and mid rpms while also losing no low end torque" and you could look it up and have your mind made up.

I mean, I can dream anyways.

whiteeg

go with the 4-2-1....better midrange...had aT1R header(4-2-1) wich was great....tryed a jdm 4-1, it was flat midrange..know have a TODA(4-2-1) and back to normal and even better....no dyno..butt by the seat of my pants....

TrizzyDizzy

AFAIK, if you are a daily spirited driving person, then 4-2-1 is just good. Now if your car is always in the high rpms (ie racing alot), 4-1 is the way to go, correct me if im wrong please!

Spade

&lt;---put down 125whp with a stock engine

AEM CAI, Edelbrock Intake Manifold, DC sports 4-2-1, and a 2.5" cat-back, that's it no other mods.

Oh yeah, it was a 2 piece as well. If you ever have to drop the oil pan, you'll love the fact that you don't have to remove the header.

IMO, 2 piece 4-2-1 without a doubt

HATCHingMN

4-1 for all motor....go for the peak power

TrizzyDizzy

So what about Supercharged? Would 4-2-1 be any better?

Spade

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TrizzyDizzy &raquo;</TD></TR><TR><TD CLASS="quote">So what about Supercharged? Would 4-2-1 be any better?</TD></TR></TABLE>

&lt;---would still use the 4-2-1 the 4-1s don't make enough of a difference IMO....whats 2 peak HP if you lose 5 in the midrange?

EDIT: Oh yeah, one more thing....."mid range" is 3500-5500.

TrizzyDizzy

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

&lt;---would still use the 4-2-1 the 4-1s don't make enough of a difference IMO....whats 2 peak HP if you lose 5 in the midrange?

EDIT: Oh yeah, one more thing....."mid range" is 3500-5500.</TD></TR></TABLE>

Yea i guess thats true. And if midrange is that "high" i guess it makes alot more difference.

2kstreetcivic

do one peice headers make more horsepower than 2 piece since they are only 1 piece and wont leak?..and how likely is it for a 2 piece header to leak??

HATCHingMN

hp dont matter on a 1 piece or a 2 piece.
it only matter on the tubing design, 4-2-1 or 4-1

I'll get the 4-1 one piece though

2kstreetcivic

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HATCHingMN &raquo;</TD></TR><TR><TD CLASS="quote">hp dont matter on a 1 piece or a 2 piece.
it only matter on the tubing design, 4-2-1 or 4-1

I'll get the 4-1 one piece though</TD></TR></TABLE>

so the 4-2-1 wont leak?...and why would I get the 4-1??..someone stated that mid range is considered 3500-5500 and that 4-1 goes flat on the mid range...so it sounds like 4-2-1 is better, right?

EJ8kid

ok so 4-2-1 would be best all around power w/ aftermarket cams?