If it's just a cat-back, I wouldn't even worry with it. It's not going to cause any problems. If you mean headers, etc. maybe a real tune is in order. Intake changes tend to wreak more havoc than exhaust changes.
Freeing up exhaust usually results in a rich condition (not harmful in the short run).
Freeing up intake is much more likely to result in a lean condition (Can cause big damage in small time).
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