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What's the rest of the exhaust?
A cat will help, but not if you have an N1 or something else similarly stupid loud. A catted front-pipe (even stock) isn't really going to hurt power NA - nor will the catback.
Based on the descriptions, you will lose any escalation. Fix it. You can get a very quiet system that makes crazy good power, even catless (see the Ace Laguna setup)
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