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Originally Posted by sp00ln
The WRX has a stock EGT?
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Yep, there's an EGT in the uppipe the ECU uses to make sure the pre-turbo catalytic converter is operating at the propper temperature.
If you replace the up-pipe w/ a non-catted pipe you tend to get a P0420 CEL code "inefficient catalytic converter". The simple fix is to replace the EGT with a 2.2kOhm resistor.