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You can have a post cat sensor go bad even with a tune that doesn't pull codes for inefficient catalyst and kick off a code for another problem. It could be sensing an exhaust leak or the rear 02s can go faulty. I know this happened to me.
Mahmood post the codes and someone will steer you in the right direction.
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2020 Ford Mustang GT 6MT PP1 444rwhp
(Sold)2013 M3 Coupe-MR/BLK ZCP, 2011 M3 Coupe-MR/Blk
2007 Porsche 997C2S Speed Yellow/Blk sport seats
2004 BMW M3 Imola/Blk
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