as everyone knows..94-99 gsr's have the o2 sensor in the cat.NOT on the header.ls and type r headers have the hole in the header..and from what i've seen jdm 4-1's with 2.5 collectors have the sensor in the header..so what have you guys done? emissions isn't a issue where i live..i have a tanabe cat-back..and i want to go without cutting it if possible. isn't the jdm header longer?what cat should i use?i want everything to bolt up.

any help from guys will be great..i got a dc 4-2-1 right now..time to upgrade

 

Since you need a different cat or test pipe with the bigger collector on the JDM 4-1 header, you just get a cat/pipe that doesn't have a hole for the o2.

Even if it does have the hole, you just get a bolt to plug up the hole(s). I've heard the thread size being mentioned as M18x1.75 for teh sensor. I haven't confirmed that for myself yet tho.

 

i thought ls and type R headers where longer than gsr..because of the 02 sensor..wouldn't that being longer,then a gsr size cat(minus the hole or plugged up)be longer and cause my cat-back to not bolt up?

 

 

see in the pic above how the gsr 94-99 is shorter...if i get a type r...or a jdm with 2.5 collector..it'll be overall longer...thus my cat will be back farther..and my cat-back system wont bolt up...

anyone?

 

I think SMSP on this board will make you a high flow cat that fits your GSR. Otherwise get a test pipe made to fit.

 

that's funny, i have a '01 2dr integra GSR and my o2 sensor in on the cat and i think my header is shorter...what's going on?

 

You have 2 02 sensors...one in the header as well as one in the cat.

As for the poster, what theyre recommending to you is to get a custom cat for your application. If its a 94-95 GSR, youll need a cat with no 02 bungs in it, and just move the 02 sensor to the bung in the header. If youre 96-99, you'll need a cat with 1 02 bung in it for the second sensor.

Or, like IN VTEC recommended, you have the option of plugging the header bung with a bolt, and just getting a custom cat with an 02 bung in the same location(s) as your stock sensor is now.

Bottom line, you will need to either chop off some piping or get a custom cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by darrinbrewer &raquo;</TD></TR><TR><TD CLASS="quote">see in the pic above how the gsr 94-99 is shorter...if i get a type r...or a jdm with 2.5 collector..it'll be overall longer...thus my cat will be back farther..and my cat-back system wont bolt up...

anyone?</TD></TR></TABLE>
answer to your question is in your question. get a type r cat.

 

Yeah I just received a jdm rsr 2.5 inch exhaust with a jdm cat and 97 jdm itr header with 2.5 inch collecter. Since my car is obd1 and the header was odb2 I just put the o2 sensor into the header bung

 

Does a 96 Ls... Have one one the header an one the cat???

 

will a JDM ITR 4-1 header bolt right up to my '01 GSR without any modifications???

 

No it wont Cause of the collecter size... i have just ordered it for my Ls i had to get a new cat from car sound 2.5" already sized up an ready to go... well post pics as soon as i get it

 

is the JDM ITR header flanges at the end to the cat different then the stock one?

 

im just talking about the header, it will bolt on perfectly as a replacement to my stock header, right? yea i know the collector will be 2.5"

 

wassup?

 

You've posted another thread about this same topic before. Just talk to Dave at SMSP or Mike from IPS Racing and they'll be able to get you out a carsound cat that will bolt up directly with the JDM length header. I got my cat from SMSP and it is shorter so everything bolts up perfectly without having to cut and weld. There are two o2 sensors, so one will bolt into the bung in the header and the other will bolt directly into the cat.

 

bump...interesting.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HecticRhythms &raquo;</TD></TR><TR><TD CLASS="quote">You've posted another thread about this same topic before. </TD></TR></TABLE> you must not be talking about me. i didn't post anything related to this in the past..go search for stuff created by me! i posted this on july 1st..and it came back to life.

anyway..i ordered a ceramic 4-1 jdm dc header for $265..supposed to be shipped today(wednesday-aug. 13)