Citric Acid? To clean Catalytic Converters? For real?

[mrnickleye]

If you keep your engine running properly all the time, and fix things right away, your cat will last for nearly the life of the car.

My cat was original, 15 years old, and I still passed Calif Smog test.

I went to a new (and larger diameter opening) Magnaflow when I did a complete exhaust system upgrade.

I manage a smog test & repair station, so I retested the car with the new cat to see the readings. They were close to the same, so the old cat was working very well.