Hey folks I just bought one of those cheap ebay test pipes that are marketed as hiflow cats. It doesn't appear to have an o2 sensor bung. I have a Greddy SP2. will I be able to move the cat sensor to the bung on the SP2? Are the wires long enough? Is the bung the same size?

 

LOL, I just bought one too. I think w/ the 97-99s, there's no sensor for the cat so I dont have to worry about that.

 

Hey Karim. cool. maybe i should have made a local thread.....lol

 

Yea, IIRC 97-99's have an s-pipe between cat and b-pipe, that's solely there for the 02 sensor (and to make up wasted space by an exhaust redesign).

 

i asked a similar question to this and someone said i wouldnt be able to do it cause theres o2 sensors and that would cause my check engine light to go on every now and then and now someone is saying the cat doesnt have a o2 sensor. can someone explain.

 

95/6 have a rear O2 sensor, the others don't.

 

From what I understand my the 95-96 cat has an o2 sensor in it. The test pipe doesn't have an o2 sensor bung so there is no place for it to go. I have two options. I can get an o2 simulator or find another place for the sensor to go. I'm thinking that I could put the o2 sensor in the bung thats on the Greddy B-pipe. Only problem is that I don't think the o2 sensor wires are long enough to reach. Would it affect anything if I just used regular wires to extend it?

 

the 95/96's have an O2 sensor on the cat, and the 97-99's have one slightly after the cat mounted in the b pipe. Get an O2 bung welded on somewhere or get a sim.

 

just be ready for sum raspynessistity and sum funkadelic odor




had a CM test pipe and uninstalled it cause of that...

 

Ok i guess it all makes sense to me now i guess i just have the exhaust shop make me a custom cat. i heard bad things about the Random Technologys Cat i heard they burn up pretty fast. and they melt in stuff.

 

bump.....no answers?

 

you have 3 choices get an o2 bung welded into the cat, get an o2 sim or just extend the wires. no it wont affect it if you do just make sure to line them up the correct way

 

Got another question. I just got up under the car to start the install and I noticed something.....The CAT's o2 sensor's thread is small. Too small to fit in the bung on the b-pipe. Do you think I could take the direct-fit o2 sensor I have already and just splice the wires.(It's one of the y-pipe o2 sensors.) Are all 3 o2 sensors the same? Do they all do the same job? I don't know.

 

They are not all the same. The 2 up front control AFR under light load/throttle situations. The rear cat monitors the condition of the catalytic converter. They are also different physically, and also share different harnesses(i.e. plugs/connectors).

The rear one can be simulated using any related o2 simulator.