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I did cat delete and have persistent CEL. I've read about a few ways to disable the light. Some are intriguing and I just don't have time to try them.
You won't gain performance unless your cat(s) was bad (like mine).
I don't mind the CEL, and I'm not concerned with my contribution to Earths air pollution, but I DO have some regret about the new exhaust odor. It's embarrassing. When/if I stand within 10' of the tailpipe (with engine idling) with a customer it is embarrassing. It'll wilt flowers and make your eyes water, figuratively speaking.
The tip I put on mine lowered the note at least a semi-tone...and the 3 foot res does the rest. altho I do have an Alfa Romeo recording on my iPhone.... I just need an outside speaker! 950 watts should do fine.