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Is the heat sensor absolutely necessary for r33? I am planning on having straight pipe from collector to rear muffler put in, with small section easily removable so catalytic can be installed for our mandated emissions testing done every year. But I see temp sensor in test pipe on car now. Will car run on funny maps if it sees no temp from this gauge, or is it just to turn on "idiot" light on dash when temps are too high with-in catalytic? Thanks for all opinions.
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Idiot Light

You've guessed it.

It is a warning only device and expects to see moderate exhaust temperatures.

If you have unburnt fuel making it's way down to the catalytic converter, it becomes a bit of a bomb and so the warning light is activated.

When the temperature goes back down the light goes back out.
 
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