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If I understand you correctly it sounds like Perrin is using the stock sized donut. If thats the case its smaller than 2.5" Last time we checked we had our 2.5" front pipe with the bigger ID donut gasket and it fit in the OEM catback. The OD should be the same but with a bigger ID to accept the bigger 2.5" pipe
Can you snap some pics if you get a change
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