New Member Introductions - 2000 honda civic si

How do headers improve the car/engine? Do vehicles have stock headers and we add bigger ones?

They improve performance if that what you are implying.

If its on an Si, its just one header. Any 4 cyl. And they do improve performance. I think that they just allow more airflow from the intake. Im probably not exactly right on that, just what I think.

Thanks 2000 LoW reD Si. I appreciate your answers. Thanks Remmy.

It improves the flow of exhaust from the engine, they are better than stock manifolds, and are best accompanied with a cat back exhaust and a high flow cat-converter, again, I'm not gonna try to sound like a know it all, just gonna add my two cents where I can.

The thing I dont like is when you get them they are all nice and pretty then you put them on and drive and they turn blue.

Where do the headers connect to? Are they attached to the catilic converter? Do Civics SI have two catilic converters?

Yes it is attached to the catalitic converter and there is only one. The other thing you are probably seeing is the resonator.. But a header is worthless if not accompanied by a test pipe/highflow cat and a catback exhaust system.. holla

ORIGINAL: natecivic92

The thing I dont like is when you get them they are all nice and pretty then you put them on and drive and they turn blue.


mine isnt blue

whats the difference between a Axleback and a catback?

So if I replace the exaust and the headers but dont replace the cat it will be worthless?

First... Read this. (http://www.hondacivicforum.com/m_39893/tm.htm)

...then understand that it's not just larger runners on a header, a header has a scavenging effect to "suck" out spent exhaust gasses so that fresh, oxygen loaded air can be used for combustion (among other things).

if thats to confusing...

1)axle back is frome the rear axle back..so like..a pipe and a fart can(worthless unless u worship fast and the furious).

2)a cat back is from the cat converter back...so...the pipes after the cat back to and including the muffler. ( not as worthless,but doesnt do to much without a highflow cat/test pipe)

3) a test pipe is illegal. just to inform you. iv had them on most of my cars.

4)i dont know why you would replace the headers, and cat back, but not ur cat...but if you did. it would not be worthless, but you would still be holdin' back per say.

its really an all or nothin deal, alltho every part helps (some more then others) you wont find alot or perfomance difference, unless u change out your whole airflow system.
(intake, manifold, headers, downpipe/b pipe ( the thing with the rezonators after the headers), highflowcat/test pipe and cat back. changin your valvs and your gaskets on older motors is always good to.

Damn thats a lot of ****! Whats a test pipe? I was thinking of purchasing this -

HIGH FLOW CAT:

High Quality T-304 Full Stainless Steel.
Direct Bolt-On, NO Modification Required. Easy to Install.
Increase Air Flow and Performance
DC-S STAINLESS STEEL RACING HEADER:

DC-S 4-2-1 Stainless Steel Header.
O2 Sensor Insertion & Metal Gasket.
EXHAUST:

Light-Weight Design. Made with T-304 Stainless Steel.
Hi-Flow Design. Increase up to 15 HP.

you wont see that hp unless you get everything.

Whats a test pipe????