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I've had to do the catalytic conveter on one car in my life - my Ford Probe, but it needed replacement at 139K miles and that was back in 1991.

We had one car where we had to swap out the cat twice! Once my independent guy did, the other one I did myself.. But the 1982 Mazda RX7 was the culprit.. Just start noticing a loss of power, turns out the leading edges of the cat honeycomb were melting down, blocking the exhaust flow.. They had it too close to the engine, I guess, maybe if it ran lean it got a tad too hot, but they weren't noted for running lean.. great little fun car, but it did need care to get it past the CA emissions tests.. In any case the exhaust evidently could exceed the platinum melting point!

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