used usdm cat VS new muffler shop cat

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Aug 8, 2003 | 01:19 PM

jwlmike

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Joined: May 2003

Posts: 86

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From: bay area, ca

used usdm cat VS new muffler shop cat

Would a used 97 gsr oem cat reduce emissions better than a new universal cat? I want worried about hp or power, just cleaner emissions.

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