Quote:
Originally Posted by RaisedOnPorsches
All those cat-bypasses that you read about people doing are mostly relating to 2.7L and 3.2L Boxsters where they have four cats total, two per side. Folks are bypassing the secondary cats.
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"Mostly." Four cats are North America, possibly only USA-specific. Over here in ROW-land we only have the second set of cats, none built into the headers. FWIW.