Another thread here was asking about removing the catalytic convertor.
The legal impacts only apply for road licensed vehicles, pure trailer queens don't need them.
Unless you are ready to completely rework the engine management system (the computer) and the exhaust system, removing the catalyic will have a serious detrimental effect on you engine and performance.
What would happen?
Without the catalytic the second O2 sensor would always have false readings and keep trying to lean out the fuel delivery. making the engine run bad and hot.
Without some of the beneficial back pressure that the cat gives you will have raw flame passing through the valves greatly shortening their life.
and lastly without the cat on the road you risk becoming a donater to the state. Every state I know of has some pretty serious fines for knowingly removing the catalytic convertor.
So what options do you have?
Replace with a new stock covertor and your rig will run as designed.
If you have upped the intake volume so it breathes easier you can get a high flow cat that will process all the exhaust your angry squirrels can breathe out while still giving the O2 sensor the right mix and the law no reason to seek donations from you.
For 99% of DD rigs replace it with stock CC and it will do what you need. The only reason to replace it in the first place is if your engine was running bad or burning oil for some time and it clogged.
Not that Im for not running a cat, my Jeep still has one, but in CT if your vehicle is 25+ years old they dont care if you run open headers But youre totally right in that the engine was designed to work with a cat and without that back pressure, bad things will happen over time
89 Wrangler-3.5" HD BDS lift,M.O.R.E HD 5/8" booms on 35" KM2s
99 Cherokee-2 door,5" lift on 35" KM2s
04 Grand Cherokee Overland
72 Chevy Nova-in progress http://tiny.cc/BRASSBALLSOFFROAD
the cat is a federally mandated deal. just because your state no longer does smog inspections on your vehicle, they are still required and you can be fined. we just had this thread about three or four weeks ago and someone found it in black and white.
cats don't hurt your performance, even with a carb. i have a cat on my 87. it helps mellow out the exhaust note
I don't feel like working on anything, at this time.
Sorry this is information you picked up off the internet and are now claiming it to be gospel.
OBD1 does not have a downstream O2 (91-95 ish)
Most but not all OBD2 (96 up to hmm not sure) DO have a downstream and it IS used for fuel management. However the ECM algorithms have plenty of capacity to over ride the lack of or falseness of the downstream O2 voltage signal.