4-1 headers yay or nay?

[AL-]

Hi ive searched & have not able to found the exact info im looking for

I would like opinions of fellow enthusiasts out there who utilise a 4-1 header in their b16a/b18c setups on the following questions:

1. Are there noticeable low/mid range losses?

2. What performs better TRR or PRO 1 or 98 spec ITR?

3. What dyno gains did you see after installation?

4. How would you rate the sound it emits over the 4-2-1 counterparts or stock manifold?

Any feedback would be great!

[Cyclone21]

learn to post in the right section.

learn to search.

[AL-]

No offense i know your just trying to do your job but If you refer to my inital post I have stated I've already searched & not found the answers im looking for

[Matty]

1. Not really. B16As don't have any bottom end to speak of anyway.

2. No idea, mine's custom built.

3. About 9wkw when dyno'd with short ram intake. Only a guess based on other stock B16As run on the same dyno as I didn't dyno it beforehand.

4. Can't say as I did the full exhaust at the same time. Don't buy a header/exhaust for your Honda just for the sound as most of them sound like ass. Mine sounds like a Subaru between 2500 and 3000rpm and a very lumpy-cammed engine at idle (partly due to timing).

[garg]

hmmm 4-1 dc sports headers 8)

[Duffman]

From memory I think someone said the TRR headers were almost as good as DC Sports and under the faq there is the big header test which has dc sports and 98 ITR so that gives an idea of what they will go like

[Macros]

I read an onine article a while ago on a USDM ITR. Aparently the TODA 4-1 headers had the most gain (slightly).

[AL-]

Keep posting people! need more info! this is also beneficial to other tuners out there lookin for advice on headers.

[INPHAMISTICS]

TRR 4-1 with the springs from beyond, your car will fly!

[David R]

Apparantly the difference between 4-1 and 4-2-1 identical headers [say both DC Sports] wouldnt be noticable when driving, and the difference on the dyno is only a few kw. I'd go for 4-1 next time, or some mean 4-2-1's with really long primarys like the ones cement had on his EF (only good with a built engine).
For the price ITR 4-1's are pretty good, but TRR's would be slightly better. It all depends how much money you want to spend...

[DA-seX]

had a wee chat to basil from autopassion a while ago about it - he recommended getting TRR 4>2>1s (for b16a) over 4>1s, even for track cars

i dunno personally, i like the sound of the top-end of 4>1s but wonder how much i'd actually use it around town. Most people dont spend too much time driving above 7000rpm...

[Glassjaw]

mmmmmmmmmm go the JDM Toda goodness!!!
http://bob123e.tripod.com/thegreatheadertest/

[tysonzane]

Originally Posted by Glassjaw

mmmmmmmmmm go the JDM Toda goodness!!!
http://bob123e.tripod.com/thegreatheadertest/

Yeah that link says it all, but i still strongly believe going to the Type R 4-1 header is a great option, considering it's a genuine honda part, and are really a fraction of the price conpared to other brands like Spoon Mugen ETC, which are marginally better.

Note the 96 integra/Civc EK9 4-2-1 headers are not very good at all, compared to the 4-1 type R

[David R]

Originally Posted by DA-seX

had a wee chat to basil from autopassion a while ago about it - he recommended getting TRR 4>2>1s (for b16a) over 4>1s, even for track cars

i dunno personally, i like the sound of the top-end of 4>1s but wonder how much i'd actually use it around town. Most people dont spend too much time driving above 7000rpm...

As I said AFAIK the difference between the two [provided all other factors are the same] are only a few hp and barely noticable. Do a search and look for a comparisson of dyno graphs, I cant remember where I saw it.
Tyson's right about hte CTR header, its the same as the 96 spec ITR 4-2-1.

[AL-]

anyone running pro 1 4-1 headers here from evan @ speedfactor? as thats what im planning to purchase sometime very soon.

[MRSCOT]

I got pro1 4-1 headers, but i also got B18C...

the new pro1 headers are ever so smaller, like 2mm each pipe, than they used to be, to still allow for good low down, but also kick ass up top.
from basil at autopassion too.

i havent driven my car since i installed them tho, so i cant comment on gains/losses.

Scott. 8)

[gen-2-vtec]

Im about to purchase the PRO 1 header 4-1 from speed factor, i'll post what i think of them once their on ( 14/6/04)

Goin for the 4-1 option because when you race...you race....all....the....way...to...redline dare i say it. Vtec engines are made for top end, so why not help that along a little i say :wink:

just my opion, and only cuz i cant afford spoon :cry:

[gen-2-vtec]

By the way, really helpfull post!! no bullshit, just helpfull facts!! Luvin it!

[FLYRYD]

the only problem i have experienced with 4-1 extractors is..... they hang F**king damn low...
so if you lower your car too much... its bye bye extractors. they get dented.
thats why my car is at its current height.... (they are still getting damaged)

[BLAZED_RACER]

Originally Posted by FLYRYD

the only problem i have experienced with 4-1 extractors is..... they hang F**king damn low...
so if you lower your car too much... its bye bye extractors. they get dented.
thats why my car is at its current height.... (they are still getting damaged)

do they? i seem to have more trouble with the exhuast piping hitting..

[tysonzane]

Originally Posted by FLYRYD

the only problem i have experienced with 4-1 extractors is..... they hang F**king damn low...
so if you lower your car too much... its bye bye extractors. they get dented.
thats why my car is at its current height.... (they are still getting damaged)

Also with the 4-1 from most brand's they don't clear the front subframe on EF9/8 and i think DA6/8 as well

[AL-]

good helpful responses so far keep it coming!

I'm travelling to Tauranga next weekend to pick up my pro 1 4-1 headers from evan @ speedfactor...i will post my findings once installed.

[FLYRYD]

very gay and quick drawing...
shows why its not good to have 4-1's while low riding.

the rectangle is the bottom of the engine.

also some extractors have a BIG gap between the bottom of the engine and the pipes. which make them hang even lower

[AL-]

Originally Posted by FLYRYD

very gay and quick drawing...
shows why its not good to have 4-1's while low riding.

the rectangle is the bottom of the engine.

also some extractors have a BIG gap between the bottom of the engine and the pipes. which make them hang even lower

alans materpiece depiction yeah ive also heard 4-1s sit low which is why you have to control the ride height to achieve a suitable clearance

[Matty]

My 4-1s bear the Official Header Badge of Courage - a nice big scrape where I collected a rock that was on a drive-up kerb. Every time I drive over the top of debris on the road my sphincter puckers.