I'm looking to replace the stock b18c1 manifold in my hybrid civic cx and I wanted to make sure before purchasing a header that i'm buying the right one. Because of the swap, there would be a 5" or so gap between the manifold and the catalytic converter. I've been told and just want to confirm that headers for the 99-00 Si are a bit longer and will fill the gap w/o any modification in this situation. I'm probably going to buy a greddy to compliment my Greddy SP2 SS catback, but are there any other street legal headers, around the same price (appx$350) that I should also consider? I'm considering the JDM ITR, how would this compare to the greddy performance wise. Also I want to make sure that the header will clear the oil pan. Will the greddy for the b16 or the ITR clear the stock pan in my hybrid?

Thanks, appreciate any suggestions or comments

 

i have 95 gsr swap in my 94 si and just so happened to have a b16 header lying around and i got lucky that it did infact fill the gap from the header to the cat. the top part of the header is the stock 95 gsr and does bolt up perfectly to the b16 2nd half that connects to the cat. the b16 second half also has the bung for the o2 sensor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jlsmi2 &raquo;</TD></TR><TR><TD CLASS="quote">I'm looking to replace the stock b18c1 manifold in my hybrid civic cx and I wanted to make sure before purchasing a header that i'm buying the right one. Because of the swap, there would be a 5" or so gap between the manifold and the catalytic converter. I've been told and just want to confirm that headers for the 99-00 Si are a bit longer and will fill the gap w/o any modification in this situation. I'm probably going to buy a greddy to compliment my Greddy SP2 SS catback, but are there any other street legal headers, around the same price (appx$350) that I should also consider? I'm considering the JDM ITR, how would this compare to the greddy performance wise. Also I want to make sure that the header will clear the oil pan. Will the greddy for the b16 or the ITR clear the stock pan in my hybrid?

Thanks, appreciate any suggestions or comments</TD></TR></TABLE>

i have a GReddy stainless steel headers for LS. i used it on my gsr swap in my civic. used only one month. i can sell it for $250 shipped

 

So let me get this straight, a shorter B16A header will fit on a B18C without clearance issues? I'm pretty sure the B18C block stands a little higher than a B16. Is there still room to clear the oil pan?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Deetz &raquo;</TD></TR><TR><TD CLASS="quote">So let me get this straight, a shorter B16A header will fit on a B18C without clearance issues? I'm pretty sure the B18C block stands a little higher than a B16. Is there still room to clear the oil pan?</TD></TR></TABLE>

yes it will fit..but the clearance is very tight at the bottom..i have a b16 greddy 4-2-1 on my b18c block..

 

Is the Teg LS header the same length as the Civic Si header? In other words will it match up in correctly for my swap as well, or is the Si a more appropriate fit. If it does match up will there be less of a clearance issue than the Si, or are the two virtually the same?

I'm more or less talking about the greddy ss model, which is what I believe I will purchase in the near future.

Any suggestions for a hi-flow cat? I know the exhaust is 2 3/8" but i think the header collector opens around 2 1/2".. is this correct? What is the correct length for the cat if anyone knows, using the Si/Ls header and a greddy cat back?

Thanks

 

Also, just wanted to be sure that there wouldn't be any clearance issues (w/the oil pan) if using a greddy header..

 

since it's a tight fit, do you have any problems with rattling noises?

 

bump... anyone got any answers / suggestions

 

nope..no rattling..its a tight fit..but its not touching anything..once u bolted the bolts on the flange down the bottom shouldnt move at all..

 

hmmm ok the deal withthe header-i have a obd1 b18c1 and threw it into my hatch. the no.1 problem most people encounter is the fact that the stock 95 gsr has no "oxygen sensor" b-pipe section. so you would take ur stock oxygen sensor and use a b16 second half section. you know how the header has two pieces right? yah use a b16 one its long enough to go to the catalytic converter and has a bung for your oxygen sensor. the b16 will bolt up to the 95 gsr header but if you use an ls one or a newer gsr header the bolts may not line up. i tried using a second half section and the bolts didnt line up. sorry to bore you with the whole story i know you asked a simple question. but i used a usdm stock 95 header top half and paired it with a usdm 99 civic si b16 second half section of the header. most people have their header customed or replace the header before they do the swap. hope this info could help.

 

so if i buy a jdm itr or any header for a 99-00 b16 (ie aftermarke 4-2-1 or 4-1) it will be long enough, have a bung and bolt right up with a cat.

Or the other option would be to get the second piece from the usdm b16 manifold.

is there a certain size/ length cat that i need in this set up? Is it just the correct cat for a 92 civic?

As far as width, most of the headers i've been looking at have 2.5" collectors, but the greddy sp2 exhaust i have is 2 3/8"..will this be an issue when choosing a cat? Or will everything bolt right up, even though the greddy is slightly narrower than the collector/ cat..

Thanks

 

fitment suggestions.. size/length of cat for the civic cx or integra? B16 manifold jdm correct fit (for the 99-00 or earlier year).... bump

 

okay, so i have a 94 b18c1 swap in a 92 cx hatch.
Right now i have the usdm manifold with a bit of test pipe (temporary) connecting to a catalytic converter and to the stock cx exhaust, muffler.

I want to install my greddy sp2 exhaust (made for the civic hb 92-5).
I believe i have two options...1) purchase a b16 header (or itr, maybe ls) and a hiflow cat and everything will bolt up or 2)weld a flange at the end of the current catalytic converter and attach to the catback system (possibly 3rd option would be to get the second part of the 99-00 usdm si exhaust manifold, but i'd prefer to stay away from this option bc i eventually intend to buy a header/hi flow cat)

To continue, first please let me know if these two assumptions are correct...is the second one possible (putting a flange onto the end of the cat); i do not want to cut or alter my exhaust system in any way...
Question on this?? -Will a stock civic cat (i'm assuming civic, maybe gsr not sure which is on car probably the civic bc of fitment) reduce flow in the second set up

And, if i do decidte to buy a header made for a b16 do i buy one made for a 99-00 b16 or an older b16(such as b16b, et al). Also, would a jdm itr, or a header made for an ls dohc engine work and fit correctly as well?

Then, once that's purchased what size is the correct hiflow catalytic converter... one for a 92-5 civic or 99-00 or an integra... also is there a specific length to buy for my set up, or does it just depend on the car?

Sorry that this is long winded, i just want to get the correct info to make an informed purchase decision

 

My friend have a 99 SI on his EG and the header bolt up to the catalytic converter with no modification. I'm not the person who drop in that motor so I'm not sure if they ever did any modification to it. I'm pretty sure though, that the length of LS and ITR header will perfect bolt to EG exhaust system. I just did mine yesterday and the LS header meet with EG catalytic converter just like stock. In my case the two bolts that connect the header to catalytic coverter does not line up correctly, so I loosen the three bolts at the other end of the converter and turn it couple degrees so the header bolts line up with the converter. Hope this clarify your question.

 

excellent post, thanks for the clarification..

one brief follow up..does anyone know if the si, ls, and itr headers are more or less identical (in dimensions at least)?

I know the gsr is too short to reach the cat on the eg, while the others aren't, but i know the si comes up very close to the oil pan...do the ls, itr headers also come very close (ie not as deep as the gsr)?

 

bump

 

My Apexi B16A header did not clear the oilpan on my B18C5.

 

bump

 

this is one of the most helpful threads thus far for me!

jlsmi2: Im in the market for a header, and have a b18c eg as well. Just curious as to what header you ended up getting for your hybrid?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mssEG6 &raquo;</TD></TR><TR><TD CLASS="quote"> this is one of the most helpful threads thus far for me!

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ditto