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I'm knee deep in my project to drop the trans and transfer case from my '91 2.5/AX5. It all started when my internal slave went out. So now I'm converting to an external, will be replacing all the U joints, repainting the driveshafts and skid plates, replacing seals, etc. Having to take the down pipe off the exhaust, I am wondering if it makes any sense to cut the catalytic converter out of the system. The Jeep has low miles for its age (57K) and runs really well. What are the pros and cons of taking the converter out and putting in a piece of straight pipe? I haven't seen an O2 sensor anywhere but am not sure if there's a code the ECU might throw back? I live in a state where the Jeep enjoys "Historic" status is exempt from emissions tests.
 

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You won't get any codes. Your exhaust will stink. You will be in violation of federal law. And if your catalytic converter was in good shape you really shouldn't gain any power at all but if it's plugged up then either removing it or replacing it will bring you back the power that you should have had.
 

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The con is that it's illegal to remove a cat for a vehicle that's used on a public road, according to federal regulations..
It's unlikely that a person will be caught in a non-emissions area.

We can't discuss removing a cat on this forum because to remove a cat is illegal. OP simply asked what are the cons. We can't advise how to do it or how to camouflage it so it looks like a legal cat.

Good Luck, L.M.
 
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OP asked about the cons of removing a cat and got some good answers. I'll close the thread before it goes downhill

Good Luck, L.M.
 
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