I have a question 3rd Cat replacement - Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority
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4G Eclipse GT/SE Specific 3.8L V6 (6G75) Specific Forum


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Old July 20th, 2020, 12:16 PM   #1 (permalink)
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3rd Cat replacement

I've had RRE headers a few years now, and the car is running better than ever. At some point soon tho, I have to assume the 3rd cat will start to clog and fail due to age and especially since running headers.

So 2 questions,
1) what are symptoms of a failing 3rd cat?

2) I'm inclined to replace w/ OEM cat and pipe, but has anyone had good experience with a high-flow aftermarket 3rd cat? Do all cat-back systems delete the 3rd cat? I'm not interested in a 3rd cat delete.
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Old July 20th, 2020, 11:53 PM   #2 (permalink)
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Or I'll just throw on a test pipe and call it a day.
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Old July 21st, 2020, 12:41 AM   #3 (permalink)
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Symptoms are reduced fuel economy, reduced power, high EGT, and sometimes a fluttering sound when cracked.

Not all catbacks remove it, some add high flow cats which won't pass California emissions regulations, but are a cat still. They're a safer bet if there's any risk of inspections than straight pipe. That said, a high flow cat still means you've got to be tuned in a way that supports a cat, else you risk premature wear and damage on it. That means reduced power and fuel economy
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Old July 21st, 2020, 01:54 AM   #4 (permalink)
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https://www.youtube.com/watch?v=wHEMs7zaON4

This was right before I gutted my cats. Exhaust attempting to escape from any opening in the pipe before the cat. Also, the headers would get really hot, if you have a IR Thermometer, you'll be able to see that.
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Old July 21st, 2020, 10:51 AM   #5 (permalink)
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Very helpful, thank you both!
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aftermarket, art, back, car, cat, cat-back, delete, fail, good, headers, oem, pipe, questions, replace, replacement, rre, rre headers, start

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