Not so good, but don't worry, it's because of my NOS, you guys using petrol won't have such high temperature.

http://en.wikipedia.org/wiki/Catalytic_converter
More-recent catalytic-converter designs are not as susceptible to temperature damage and can withstand sustained temperatures of 900 °C (1,650 °F).

And I exceeded that so called more-recent limit.

The max I've seen is 800+ a bit. If fully running on petrol, 700+.

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Added on August 13, 2012, 8:32 pm

This post has been edited by mengsuan: Aug 13 2012, 08:32 PM

Both are at the same moment, 2 sensors.

On a 4 cyl, the front / upstream is called "bank 1 sensor 1" and the rear / downstream sensor is called "bank 1, sensor 2."

Read more: http://wiki.answers.com/Q/Where_are_oxygen...e#ixzz23QjD0r77

I have not tested with petrol, no money to pay for petrol.

True that, I expect to remove the cat con after a while. Especially true if I'm really turbocharging the car.

On modern cars, cat con status is monitored to ensure vehicle is operating within emission standard. There are a lot more sensors in the car if you look at the whole list of OBD2 readings.