I did a little searching and noticed no real discussion has been held about b18b and what header to use with them

MY issue with running a vtec header is that the longer header piping to the collector will only allow exhaust scavenging at higher rpms than the b18b is meant to run.
Engine setup b18b, hypermedialian exhaust,gutted cat, intake, and crower 403 cams (so revlimit around 7k)

What do people with decent b18b setups have for headers, and any dyno comparisions?

Thank you

 

I'm using the JDM 4-1. It works great with my setup

 

You are probably making around 150 - 160whp with that setup. So a 2.5" collector would be beyond overkill.

You are probably going to want a non-sequential 4-2-1 header with a 2" collector, which are quite common. Comptech's is probably the best bet, as it is the only header in that design that is stepped to prevent exhaust reversion.

You also are going to want to get either a highflow cat or a testpipe. Your cat may be gutted, but the diameter is still very small (2" inlet, 1.8" outlet). Look for something that is 2.25"

 

nice!!!
the hypermedialon is a small exhaust to start with (for ef civic) so i think a 2inch collector is probably the best to prevent a huge bottleneck catback
ill check out comptechs

 

For what it's worth, Comptech's LS header is exactly the same as it's ITR header.

 

A header that a turbo attaches to

 

JDM 4-1

 

not opinions please facts
i wouldnt mind some dynos etc
read my post, a jdm 4-1 should not be optimal for a non vtec engine, its too long

 

you have to consider, do you want more high end at the expense of low end? or more low end at the expense of high end?

 

This is blueteg's dyno of a B18B with 403 cams, hopefully he can comment

AEM CAI
Comptech 4-2-1 MIG weld header
Carsound 2.25" cat

Comptech cat-back exhaust
B&M FPR & gauge
AEM cam gears

Crower 62403 cams
Crower dual valve springs
Apexi S-AFC



again, 2.5" collector is overkill, so JDM 4-1 is out the window. There is no way you are making 220+whp to take advantage of exhaust that large.

You could go 4-1, but with as you can see here there isn't an apparent bottleneck or lack of low end up to 7k rpm. Not to mention he had it tuned for a stronger midrange/whole powerband rather than peak HP (where he probably could have picked up a few more hp up top).

 

i wil have to speak with him at the type r expo ( if he is going)
Blue care to comment?

 

excuse me for interupting but it seems that blue's dyno was a little low...is this about right?

 

i was using DC 4-1 header on my ls before i had the motor built, heres a link to my other post with my both dynos

https://honda-tech.com/zerothread?id=451684

i personally liked having the 4-1 setup, the ls had a good amout of low end power, putting on the 4-1 allows it to gain a bit more where it lacks, giving it a wider power band

now i have upgraded to a jdm R header, but its obsous that theres really no way to compair the two i upgraded because I didnt want the exaust to end up the bottleneck of the system and i raised the redline so if it alows for more top end it still works

 

what is your setup to make the 1662whp bikeboy thats about what im looking for

 

head work, 403 cams, weisco pistons to 11.3:1CR, skunk2 im, 64mm tb, still waiting to tune so it should be more

 

I've heard good things about the modified JG 4-2-1 header w/a 2.5" collector...

 

Bikeboy you runnin stock valve train?