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If its upstream, you should see an immediate and a long term change. Short term fuel trim should adjust quickly, giving you a noticable difference right away, and long term trim will slowly adapt, giving you a gradual increase in mileage.
That's assuming the sensor wasn't so trashed that you were stuck in open loop. Even then though, at least LTT is used, so you still notice better drivability.
Now the question is how did your egt's get that hot to begin with?
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