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Did you take the O2 sensors off to do this? If so, you might have damaged the sensors. They are easily damaged when removing / replacing them.
As for the gutted cats, most vehicles won't gain any power with gutted cats. I did a dyno test before and after gutting the primary cats on my Z and I lost 9 HP. It disrupts the flow of the exhaust since the exhaust is under pressure prior to entering the cat and expends in the hollow chamber and then has to squish back out of the exhaust pipe. It is better to have a straight pipe, but some state vehicle inspections will fail you if the cats are missing and have been replaced with a straight pipe. What you could do is either get a high flow cat, or build a cheater cat with your original cat housing (with a straight pipe inside the housing).
 
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