Tonyl507

I've done my searching and best i can tell:

94-01 LS/GS/RS
00-01 GSR
97-01 ITR

ALL WILL BE INTERCHANGABLE
the only differance is that the ITR (USDM) will have a bigger 2.38 collecter VS the 2.25 on the GSR/GS/LS/RS, Correct???

the 94-99 GSR header is NOT interchangable with the rest because the header will not bolt up to the catback... it'll be too short and not contain the o2 sensor hole...yet it will bolt up to the head correctly (As in the bolt patterns on the head are all the same...)

IS ALL THIS CORRECT??????

if so, then why is the

DC sports header 00-01 GSR 4-2-1 1PC (AHC-6511)

and

DC sports header 94-01 LS/RS/GS 4-2-1 1PC (AHC6606)

have different part numbers??? Shouldn't they be idenical???

Edit: reason I'm asking is i have a '97 LS with a '97 GSR motor swap. My catback and cat are for a LS, so I need a header that will bolt up to my GSR head and go to my LS catback... on a LS chassis

-=Squirrley=-

The LS and GSR are the same chassis. You are looking at different heads. The GSR has a VTEC head and the LS doesn't. Anyone can feel free to correct me but the catbacks are the same between LS and GSR. If you have a GSR motor, then you want a GSR header. It should bolt up to the rest just fine.
Anyone else have any input?

Tonyl507

I know that they are different heads, but I believe the bolt pattern is the same. Reason I know this is that right now I have my Factory LS exhaust manifold on my GSR motor.... hooked up to my LS cat and catback

Overall reason Im asking is that I want a DC 4-2-1 1PC header for my car and I can't figure out which part number to get....

Are there different oil pans or seomthing that makes the pipes bent in different places or something???

mrdeadman

Are they both 421 1pc headers? Just buy the cheaper one.

Tonyl507

yup, both the same... same price too, but two different part numbers, anyone have any idea why? Do other companies also differenciate part numbers between a 00-01 GSR and 94-01 Gs/LS/RS????

BLK_TEG_007

dude this is one of the best question i've read in a long time i never tried to put Vtec headers on my LS thinking it was going to be different

Wendys or Bust

The bolt pattern is different. Thats why you can do a ITR header on an LS but not on a later GSR.

mr_ek9

The length of the header is different. Gsr is shorter then the ls and type r header.

tomithy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr_ek9 &raquo;</TD></TR><TR><TD CLASS="quote">
The length of the header is different. Gsr is shorter then the ls and type r header.</TD></TR></TABLE>

Read what the OP said, you'll learn a little something.

Tony, I don't think there will be any difference. I have a Comptech 4-2-1 for an ITR on my '01 gs-r. The bolt patterns on the head are exactly the same, and it'll be the same for the cat also. The Comptech I have has the same part numbers though... so your best bet may be to talk to someone from DC Sports and ask them.

Tonyl507

Yeah I guess I'll call DC, it just don't make any sense to have two dif part numbers... Unless one has bigger piping or something - but it should all be 2.25....

in theroy, the 00-01 GSR headers should be idenical to the RS/LS/GS ones...

and since my 97 LS manifold fits the bolt pattern on a 97 GSR head, i guess the Exhaust bolt patterns are the same on ALL integras 94-01??

(I know the GSR has a dif. intake Bolt pattern, but I guess exhaust is similair to all the others...)

So, the only thing that fu*ks everything up is that the 94-99 GSR's have a header that is shorter then the rest???? Why Honda, why?

Tonyl507

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Wendys or Bust &raquo;</TD></TR><TR><TD CLASS="quote">The bolt pattern is different. Thats why you can do a ITR header on an LS but not on a later GSR.

</TD></TR></TABLE>

Oh, I missed that. That would explain the dif. part numbers...

but let me get this straight:

94-99 GSR: has same bolt pattern as LS/RS/GS/ITR, but the header is shorter then the LS/RS/GS/ITR...

00-01 GSR: has different bolt pattern then the LS/RS/GS/ITR, but the same length as the LS/RS/GS/ITR???

That dosen't make much sense to me.... Seems like honda would be making the parts non-interchangable for absolutly no reason...

BlueIntegraBoy

iTrader: (5)

Geez, some people don't know their stuff.

All b-series headers are interchangeable. The bolt pattern for the exhaust side is the same for all b-series heads. The difference between the 94-99 and 00-01 GSR manifolds is the length. The 00-01 GSR header is the same length as the 94-01 LS. This is because the exhaust for the 94-99 GSR was longer.

I have personally put an aftermarket 94-01 LS header on my stock 00 GSR. It bolted up fine.

Padawan

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tonyl507 &raquo;</TD></TR><TR><TD CLASS="quote">I've done my searching and best i can tell:

94-01 LS/GS/RS
00-01 GSR
97-01 ITR

ALL WILL BE INTERCHANGABLE
the only differance is that the ITR (USDM) will have a bigger 2.38 collecter VS the 2.25 on the GSR/GS/LS/RS, Correct???</TD></TR></TABLE>

Close, but the collectors for all of them are 2.0" OD. As you stated though, all are interchangable.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tonyl507 &raquo;</TD></TR><TR><TD CLASS="quote">Yeah I guess I'll call DC, it just don't make any sense to have two dif part numbers... Unless one has bigger piping or something</TD></TR></TABLE>

I think this is the most likely answer. DC Sports may alter the size of the header's piping depending upon whether or not it is a VTEC application.

SuckMyDOHC

iTrader: (1)

the height of those blocks are also slightly different.

slowsleeper

take a look at your header you are running now and see if it is short version with the 2 o2's in the cat or is it the long header where there's an o2 in the header...and then order from there, that way you know whether you need the short version or longer version

From all the cars that i worked on i believe the obd1 94-95 gsr's and the 00-01 gsr share the same header, the longer ones with the o2 in the head, 96-98 run the shorter header meaning that they run 2 o2's in the cat and none in the header, 99 gsr i am not sure.

purplegsr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowsleeper &raquo;</TD></TR><TR><TD CLASS="quote">

From all the cars that i worked on i believe the obd1 94-95 gsr's and the 00-01 gsr share the same header, the longer ones with the o2 in the head, 96-98 run the shorter header meaning that they run 2 o2's in the cat and none in the header, 99 gsr i am not sure.</TD></TR></TABLE>

It's actually a bit different:

94-99 GSR have the same header length, with no o2 in the header but either 1 o2 in the cat (94-95 obd1) or 2 o2 in the cat (96-99 obd2). 00-01 GSR has a longer header with 1 o2 in the collector, while 1 o2 is in the cat. Conveniently, the 00-01 GSR header is exactly the same as the 94-01 non-vtec header. All of them have 1 o2 in the collector on the header. On the 94-95 nonvtec, there is no o2 in the cat, and on the 96-01 nonvtec there is 1 o2 in the cat. All of them have a 2" OD collector, so the advantage of the JDM Type R header is the bigger collector and 4-1 design (it does have 1 o2 bung in the collector).

So, the OP is correct on pretty much everything except for the collector sizes. However, if you are combining obd1 and obd2 parts, you can run into little problems. If you are running a 97 GSR with the stock GSR ecu for the same year (obd2), and you are using a 97 LS cat, then you would also want a 94-01 nonvtec or 00-01 gsr header because it has 1 o2 bung in the collector. That way you end up with the correct length overall and the correct number of o2 sensors. The differing part # that DC states doesn't matter in this case, the 2 might be slightly different in terms of oil pan clearance or something like that, but they will both work fine, just get whichever one is cheaper.