Hello all, Ive scoured the forums on cat removal but still have some questions. Im interested in removing mine simply to improve the sound.

Is it true that it hurts low end torque? If so is it noticable?

I removed the cat on my old fiero 2.5 before it seized and I sold it. The buyer said that removing the cat causes the engine to run lean and eventually seize. Is this true? He also said i need to disable the egr in order to keep the engine from doing this. Again, is this true? I have never read or heard of this being the case.

If low end torque is hurt negligably, Im not too concerned. I just dont want to screw up my only car and want to be sure im not missing anything.

thanks

quote Originally posted by guitarfreak235: Hello all, Ive scoured the forums on cat removal but still have some questions. Im interested in removing mine simply to improve the sound. Is it true that it hurts low end torque? If so is it noticable? I removed the cat on my old fiero 2.5 before it seized and I sold it. The buyer said that removing the cat causes the engine to run lean and eventually seize. Is this true? He also said i need to disable the egr in order to keep the engine from doing this. Again, is this true? I have never read or heard of this being the case. If low end torque is hurt negligably, Im not too concerned. I just dont want to screw up my only car and want to be sure im not missing anything. thanks

I've never heard of such a thing. A catalytic converter is there to clean up the exhaust and has no bearing on the air/fuel mixture. The A/F mixture of the engine is determined by inputs to the ECM from the oxygen sensor, not the cat. My 88 was without a cat for a while and it had plenty of low end torque. My 1 ton duallie is missing both cats and has enough low end torque to spin the tires when I get on it. I wouldn't worry about it.

quote Originally posted by seajai: I've never heard of such a thing. A catalytic converter is there to clean up the exhaust and has no bearing on the air/fuel mixture. The A/F mixture of the engine is determined by inputs to the ECM from the oxygen sensor, not the cat. My 88 was without a cat for a while and it had plenty of low end torque. My 1 ton duallie is missing both cats and has enough low end torque to spin the tires when I get on it. I wouldn't worry about it.

I was thinking the same, I just wasnt sure if there was a post cat sensor that I havent seen.

quote Originally posted by guitarfreak235: I was thinking the same, I just wasnt sure if there was a post cat sensor that I havent seen.

Only on newer vehicles. I believe it's primary function is as a catalyst monitor.