[ZJinprogress]

i would like to do an exhaust on my 97, 4.0 zj. it would probably inlcude a hi-flow cat and some sort of a trubo muffler, my question is this, one of my o2 sensors is screwed into a bung near the end of the cat, i can get a high flow 4.0 cat from summitracing for cheap but it doesn't have an 02 sensor bung welded in, if i could move the o2 sensor from the cat and weld a nut into the exaust tube right after the cat do you think there would be any negative results, if it's going to screw with my comp or emissions i might as well just get the right one but saving money and using my skills at the same time is very appealing. thanks for your help and i apologize for any newbyness as this is my first zj.



mike

 

[jimmyjay]

Yes, that will work just fine. I have a high flow cat and did the same thing. [smilie=bal_cool.gif]

 

[xtianknight]

Get a car-sound. It is OBD II which includes the O2 sensor plug. Also, the ones from Summit are cheap (I like Summit too, but don't buy those)

 

[xtianknight]

http://cgi.ebay.com/ebaymotors/MAGN...-93506_W0QQcmdZViewItemQQcategoryZ33629QQitemZ7950579869QQrdZ1QQsspagenameZWD1V

This is a good cat. Trust me! Tell them you need the O2 sensor outlet

 

[jeepcreep]

2-1/2" High Flow Metallic Substrate Converter

2-1/2" High Flow Metallic Substrate Converter (about 20% better flow than the ceramics) $175.00
This is where I got mine :http://warpspeedperformance.com/jeep.htm
I had a muffler shop weld it on along with a Flowmaster delta 40 and it sounds sweet. I have the 5.2 though,not sure what a 4.0 would sound like.
I had a borla cat back on that i bought last June but it was too stock sounding so when my stock cat broke and started to clog my exhaust I decided to get a high flow cat and a Flowmaster muffler.
I still used the Borla tailpipe. The shop only charged me $60 .

 

[xtianknight]

The only thing I can say is the cat I used (same one on ebay) passed smog with flying colors! The guy said "I have seen newer cars pass with less, this was better than new". I have ran car-sound since the 90's.

 

[jeepcreep]

I have a 96 Grand Limited and in R.I. they don't have to put the sniffer in the tailpipe for a 96+ they just plug it int the computer under the dash and as long as your check engine light isn't on ,voila your good to go.
Besides if our going to go off roading you would want a metal substrate not a ceramic as it would be able to withstand more vibration and shock than a ceramic. when I received the high flow cat in the mail you could see right through it even at an angle. All you have to do when you call them is tell them the year make and model plus the engine and they will get you the correct high flow cat.

 

[ZJinprogress]

well the 40 series went on while ago and i want to put on my new cat soon....anyone know the thread size on the o2 sensor?


Mike

 

[Griffon327]

Not sure the exact size of the 02 sensor bung only that they are available from almost any muffler shop for around $5.00 or so

And the threads are the same as the older Chevy spark plugs not the ones with the tapered seat but the ones from the late 60's model heads. not really useful info unless you are looking to plug an 02 sensor hole and do not want to weld it permanently