If you are dead set on having cats then BERK HFC + HKS Hipower catback sounds AMAZZZZZZZZIIIING and its not quiet at all but its def not loud enough for you to get pulled over....Downside is $$$....If you want to go stock cats and save money then AAM short tails sound pretty good IMO.
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370z NISMO 0675 327 rwhp 280 rwtq - sold.
FD RX7 single turbo 508hp - sold.
Lexus IS-F 5.0L V8 
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