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Usually its a catalytic converter efficiency code, P0420 or P0430.
Sometimes it will throw various O2 sensor codes.
We have one customer who opted to stick with the stock tune, until he gets some more money for a dyno tune, and has yet to have his CEL on. He's been running around since March of this year without any codes... kinda cool, but definitely not typical.
Usually the CEL will turn on within a few hundred miles, but will never turn on immediately unless you remove the rear O2 sensors, or the installer forgot something or screwed something up.
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