hey all. new to the site and the world of ls/vtec. i had mine swapped over christmas and was wondering if it was possible for me to put a gsr exhaust on. i ordered an ls header before i did the swap and recieved a gsr instead. i've heard of it being done before, but the only problem that i have come across would be the sensors. i had an obdII before the swap and now i have a p28 obdI. what will i have to do to convert my exhaust to gsr if it is possible?

 

You should do a search. If it's a 00-01 GSR, it will bolt right up. If 94-99
GSR, you will have to chop off about 3 inches off the b-pipe.

 

so i sound like and idiot saying this....but whats the b-pipe, and its a 94-99 gsr header. you think i will have to drill a hole for the housing of the sensor. my friend told me that i can get an eliminator if worse comes to worse, but i really don't want to go that route.

 

Your B pipe is the section of exhaust piping that attaches to the back of your cat. In most cases, the B pipe contains a resonator (looks like a mini inline muffler) to adjust the exhaust note.

The GSR header you have locates the cat further back than an ls/itr header would. So, yeah, you would want to use a GSR exhaust. If you got an ls/itr exhaust, you'd have to have it custom fit. A 94-99 GSR header w/ a 94-99 GSR exhaust should have no fitment issues.

As for the sensors, you should be fine.

<U>With an OBDII wiring harness:</U>
If you use an OBDII cat, just leave your secondary O2 sensor in the bung and forget about it. If you use an OBDI cat (with no O2 bung), just tape up the plug for your secondary O2 and zip-tie it out of the way. The OBDI P28 will not look for it. Secondary O2 sensors were not present on OBDI cars. Your P28 could care less.

<U>With an OBDI wiring harness:</U>
You won't even have a plug for your secondary O2 sensor. Save it as a spare.


What head do you have? B16? I'm not sure about this, but I think you may run into problems bolting a GSR header onto a non-GSR head...

Can anyone clarify this for the guy?

BTW: Why did you accept a part that was not what you ordered?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by OBD1Kenobe &raquo;</TD></TR><TR><TD CLASS="quote">A 94-99 GSR header w/ a 94-99 GSR exhaust should have no fitment issues.

What head do you have? B16? I'm not sure about this, but I think you may run into problems bolting a GSR header onto a non-GSR head...

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

If you use the 94-99 GSR header and 94-99 GSR exhaust you may still have problems with the cat. I believe the 94-99 GSR cat is around 14 inches long, while the 90-01 LS has a 17 inch cat. You could also run into problems with the o2 sensor. If you have a 94-99 GSR header, there is no o2 bung on it, and if you have an 90-95 LS cat, there is no o2 bung on that either - So then you would be left with a header, cat, and exhaust that bolted up, but had no hole for an o2 sensor. The 94-01 LS and 00-01 GSR/USDM ITR headers all have one o2 bung at the collector, while the 94-99 GSR does not.

As for the B16 head, it shouldn't be an issue, any b-series header will bolt on fine. The only difference will be in the length and the height, as long as you aren't using a 99-00 Civic Si header (unless using a b16 head gives you enough room to fit a b16 header past your ls oil pan), you will be able to clear your oil pan, and you may have to get some welding done to get your header, cat and exhaust to agree with eachother.

 

so basically yoru saying i have to go 94-99 gsr exhaust all the way back including the cat converter. but i will still have that o2 sensor in the header problem......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LsVtec98 &raquo;</TD></TR><TR><TD CLASS="quote">so basically yoru saying i have to go 94-99 gsr exhaust all the way back including the cat converter. but i will still have that o2 sensor in the header problem...... </TD></TR></TABLE>

If you use a 94-99 gsr exhaust, header, and a 94-95 gsr cat, you will be good. You will have an o2 bung in the cat. If you use a 96-99 gsr cat, you will have 2 o2 bungs in the cat, so it would fit in terms of length, but you would have to buy something to plug up the second bung without having a leak or anything.

 

what if i just took the sensor thats in my ls header right now and put it in the 96-99 cat. that would work right? or would i be getting mixed signals from my sensors. im also about to buy a p72, so if i do get all that, it should work right?

 

as long as the 2nd one isn't plugged in, it doesn't matter, at least with an OBD1 computer. If you had an Obd2 computer, you would have a wire for it and you would need 2 o2 bungs anyway.

 

will a p72 work, cause i heard that ls blocks don't have knock sensors

 

LS blocks don't have a knock sensor, but you could just wire up the knock sensor wire from the p72 and ground it to the block, or buy a custom ECU (Hasport) or run Uberdata to make your ECU bypass that function. Search around the ls/vtec threads, make sure you look in archived topics as well.

 

hey thanks a lot bro. you help is much appreciated. i think im ready to order the exhaust now.....peace