The EGT sensor sits in the original cat and some de-cat pipes have a flange welded on to fit the sensor. If the price difference ain't too great for your wallet then obviously best to keep the sensor.
Worth checking you can remove it from the old exhaust first as the last one i tried was impossible without irreparable damage. If you can remove and don't go for the de-cat with a flange then just poke it up through the floor or unplug it under the seat.
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