longevity of stock cats

[OneBADLsE]

Approximatly how long should stock cats last?

Given the two variables:

Driven hard daily
mostly highway miles

[RoyLPita]

2 words....................... Pot Luck.

[ctrlraven]

2 words....................... Pot Luck.

Pretty much, if you haven't removed your rear cats, you should do so now lol.

[Marauderjack]

Approximatly how long should stock cats last?

Given the two variables:

Driven hard daily
mostly highway miles

Catalytic converters will last indefinitely IF the engine is maintained properly and in good running order!!:beer: The main killer is a very rich condition usually caused by stuck injectors or bad carb???:shake: Some CV cabs have 400K miles on OEM cats and they still work fine.:bows:

I think the EPA considers 100K miles the effective life of cats and you may replace them without possible fines above 100K miles......below that they are the responsibility of the manufacturer!!!:cool:

Removing them is not legal period and will NOT improve performance UNLESS they are plugged up!!:shake:

I removed mine at 105K miles and replaced the 4 OEM's with two Magnaflows and the performance is fine...as is the exhaust sound!!:beer:

Marauderjack:burnout:

[Stranger in the Black Sedan]

Cats are a small restriction, but a restriction nonetheless. If you dyno'd back to back, only removing cats, I'm sure you'd see a few hp increase. I would not take them off on the street because I like to breathe clean air just as much as the next guy... strip only car, sure.