The cat in the primary down pipe doesn't have any sensors relative to it.
My Gen2 GTB had a factory EGT sensor in the primary down pipe. When I had a custom exhaust made up, they refitted the sensor and I had no worries with CEL or cat overheat lamps.
Rather than just being ghetto and gutting the cat (good luck anyway with those angles) the primary dump can be removed from the rest of the exhaust independently . May as well have something made up, easy job for a zorst fabricator.
wasnt thinking of gutting out the cat, plans is to remove the cat altogether and modified the primary pipping with a wider hole exhaust to allow a free flow