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High flow cats (200 rating) are showing 20+ RWHP gains without a tune using stock mainfold and exhaust. That is definitely not trivial. Complete removal is illegal but I've never seen anything say what the minimum rating is for 'legal' cats.
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2010 Camaro SS Imperial Blue | CAI Inc, CAI | Solo Hi Flow Cats | X-Pipe | Backup Camera | PDIM
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