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The 01 S muffler and the 03 base muffler is interchangeable. The 03 muffler sounds better than the 01 because it was modified to provide more growl at lower rpms. I don't think it adds any performance gain though.
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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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