4-1 vs 4-2-1 headers

[Pandemic]

Ok I know that 4-2-1 offers more bottom end torque. 4-1 is better for high end.

As a result of that, I think 4-2-1 is better for me.
The question is, what is better for gas milage? better low end is probably the answer. Cruising speeds at around 3000rpm.


what is a good price for headers, especially on ebay? Some are like 50 bux total... err plastic?!

I notice that some dont have a flex pipe (which is whats bad on my car)... would you recomend getting headers w/ flex pipe? I think i'd rather that but not sure.

Thanks!

[Pandemic]

now that I look, megan racing headers are 4-2-1 stainless steel with flex pipe... think thats best bet. Objections?

[Pandemic]

http://cgi.ebay.com/ebaymotors/Megan...QQcmdZViewItem

do you think there will be any problems with sensor locations?

[steelbluesleepR]

the main reason there really arent 4-1 headers for our car is that it would be an absolute bitch to put them in. with the right design, a 4-1 would make more power, but the megan headers are a good bet. they have 2 o2 bungs on them, one on the upper piece, and one on the lower, so you dont have to worry about that. i have a bad flex-pipe as well and i am considering several different headers, and the megan is topping the list of "if i had the money" right below bisi's headers.

[Pandemic]

Good point, didnt think about space. Yeah I think this megan racing one looks pretty ideal. Good price, really cant be far off of a DC, aside from CARB or something...

I think a replacement flex pipe for our car is like $100... why not spend 75 more and get a bit better performance :P Stainless steel > ceramic, right?

[cornerkid322]

4 to 1 is theoretically better considering that there is less bends and transfers the smoke has to go through to get out the muffler, but as said before, im pretty sure its abit of a bitch to install them. i have megan headers, their... ok, i had to custom fit my A.C. compressor and ac lines to fit the headers, and my gaskets blew on it and now my bolts wont come out, but i think that was caused by bad motor mounts bending them so much.

[F20A CB7]

4 to 1 is theoretically better considering that there is less bends and transfers the smoke has to go through to get out the muffler, but as said before, im pretty sure its abit of a bitch to install them. i have megan headers, their... ok, i had to custom fit my A.C. compressor and ac lines to fit the headers, and my gaskets blew on it and now my bolts wont come out, but i think that was caused by bad motor mounts bending them so much.

Besides this KAMIKAZE header.

BISImoto has 1 also, not in the market jus yet.

CISCO is usin the PICTURED header for now til BISI has his in the market

http://kamikazeperformance.com/store/shop/index.html

[lokuputha]

Besides this KAMIKAZE header.

That header looks pretty cool


Seems like it would do best with a high rpm motor. The new K series has primaries that are similarly short

[F20A CB7]

That header looks pretty cool


Seems like it would do best with a high rpm motor. The new K series has primaries that are similarly short

DAM rite!

I have a A1 stock 4-1

i want this header jus for the high end power, my sohc is runnin pretty good, with the 11.5 pd flywheel i do feel more power on the topend. also with the 2.25 pipin, BUt this header is 2.5 collector. Ill b creating a bottle neck since i have 2.25

I didnt wanna loose my low end, thats y i got that size. but goin from 2.25 to 2.5 will i feel even more top end?


i would like to get that header with 2.5 mayb on a twin cam. si

[Camurai]

CISCO is usin the PICTURED header for now til BISI has his in the market

Cisco is running an F22A4 header. It's a 4-2-1 tubular design. The best-flowing OEM header Honda made for the F22A.

[F20A CB7]

Cisco is running an F22A4 header. It's a 4-2-1 tubular design. The best-flowing OEM header Honda made for the F22A.

RED PROJECT-CISCOEngine:

*Block is stock & tune-up was completed*

Miscellaneous OEM Project-Install Parts >> INSTALLED
Bomz Short-ram Intake >> INSTALLED
Maxbore 67-64mm Taper H23 TB >> INSTALLED
Maxbore Port-matched H23 Plenum to TB >> INSTALLED
CHR H23 P&P Intake Manifold >> INSTALLED
CHR F22 Street Ported Cylinder Head >> INSTALLED
Delta 272 Camshaft Regrind >> INSTALLED
Kamikaze 4-1 Header w/2.5" collector >> INSTALLED (needs replacing, POS)
2.5" Custom Exhaust >> INSTALLED
2.5" Catco High-flow Catalytic Converter >> INSTALLED

unless he changed it

[lo-specials]

RED PROJECT-CISCOEngine:

*Block is stock & tune-up was completed*

Miscellaneous OEM Project-Install Parts >> INSTALLED
Bomz Short-ram Intake >> INSTALLED
Maxbore 67-64mm Taper H23 TB >> INSTALLED
Maxbore Port-matched H23 Plenum to TB >> INSTALLED
CHR H23 P&P Intake Manifold >> INSTALLED
CHR F22 Street Ported Cylinder Head >> INSTALLED
Delta 272 Camshaft Regrind >> INSTALLED
Kamikaze 4-1 Header w/2.5" collector >> INSTALLED (needs replacing, POS)
2.5" Custom Exhaust >> INSTALLED
2.5" Catco High-flow Catalytic Converter >> INSTALLED

unless he changed it

It probably is. But said earlier, 4 - 1 are the best for high rpm's and Cisco's engine is built for high rpm's

[Camurai]

Ah, I see the mixup. He's running a Kamikaze header on the Red Project, and an A4 header on the White Project. Two cars to keep up on, they just got mixed up. F20B mentioned Cisco running the Kamikaze until the Bisimoto header was finished which is why I referenced the A4 header. He's not going to put the Bisi header in his Red Project. The Bisi header is intended for the White Project. Unless he changed his plans and came into some extra money, that is.

Final Engine Install Photos:

Engine Overall (stock F22a4 header for engine break-in, Bisimoto header coming):



Distributor Area:



MSD SS Blaster Coil/Centralized Ground Area:



Oil Catch Can Area:



P/S Fluid Resorvoir Area (minimized P/S fluid system capacity, removed main lines):

[F20A CB7]

a4 on the white project, kami header on the red

[Pandemic]

4-2-1 is better for low end and therefore better for gas milage, right?