to cut or not to cut...

**tra1ldust** · 04-02-2009, 01:55

the catalytic converter off my jeep? input, pros and cons, etc...appreciated

**GP4Play** · 04-02-2009, 03:00

If I could cut it out I would (Ca. Sucks),but I have a CJ and it won't affect the computer Don't know about TJ.If you do cut it ,save it just in case.

**Bigskyxj** · 04-02-2009, 05:34

CUT
ALWAYS
ALWAYS, dont even think about it.

**Bigskyxj** · 04-02-2009, 05:36

Infact, we all need to write Jeep and inform them that sawzall's should be a standard factory feature.

**JavaTee** · 04-02-2009, 06:01

Originally Posted by BAJA KRWLR

the catalytic converter off my jeep? input, pros and cons, etc...appreciated

I'm not an emissions guru, some systems have two O2 sensors. If you have an O2 sensor 'down stream/system' (ie below/past the cat) then I might consider a high flow cat replacement instead of complete removal, due to computer info reading/changing the air/fuel mix (among other things). Other than that, it's gone in my book.
Later, T.J.

**Erik719** · 04-02-2009, 08:34

Depends on a few factors. When I was stationed at Carson I had to have my vehicles smoged, but they didn't do a visual inspection (at least where I got it done). So if you can pass the "sniffer" test you could cut it off.

When I did my engine swap in CO I didn't put any of the emissions equip back on the engine (smog pump, a shit load of vacum hoses, etc) and when I went to register in CA I had to spend about $1500 to retrofit everything to get it to pass.

My Jeep is now 25 years old and no longer requires a smog check in VA, but I'm told that they will do a visusal inspection (as part of the required safety inspection) and all the emissions equyipment must be present. I haven't registered the Jeep in VA yet so I can't tell you for sure. Of course you can always shop for inspection stations as some will do a more through job than others.

I've read that modern CATs don't really effect power that much and as someone else said their is an O2 sensor issue.

My advice would be to leave it be. Get a good set of headers and a CAT back exhaust and I think you will be happy.

**tra1ldust** · 04-02-2009, 09:32

oh man forgot to mention it's a 2.4L...what will it sound like with no muffler?

**Fred** · 04-02-2009, 14:09

With no Cat it will smell a little funny and with no muffler or cat it will sound like an angy bumble bee. It MAY throw an emissions code due to the O2 Sensor but likely not. I would say as said above cut it, and save it if you need to put it back. I am scrapping the one on my truck but it's a deisel

**afrats** · 04-02-2009, 20:32

Originally Posted by Erik719

Depends on a few factors. When I was stationed at Carson I had to have my vehicles smoged, but they didn't do a visual inspection (at least where I got it done). So if you can pass the "sniffer" test you could cut it off.

When I did my engine swap in CO I didn't put any of the emissions equip back on the engine (smog pump, a shit load of vacum hoses, etc) and when I went to register in CA I had to spend about $1500 to retrofit everything to get it to pass.

My Jeep is now 25 years old and no longer requires a smog check in VA, but I'm told that they will do a visusal inspection (as part of the required safety inspection) and all the emissions equyipment must be present. I haven't registered the Jeep in VA yet so I can't tell you for sure. Of course you can always shop for inspection stations as some will do a more through job than others.

I've read that modern CATs don't really effect power that much and as someone else said their is an O2 sensor issue.

My advice would be to leave it be. Get a good set of headers and a CAT back exhaust and I think you will be happy.

El Paso County stopped doing smog inspections 2 years ago. The EPA said our air met standards and we no longer need it.