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.