EVOMIND,
For the 2000 model year Porsche equipped US models with two catalytic converters per side (four total). The additional cats were called warm-up catalytic converters.
I have a 1999 Boxster (only two catalytic converters) and I have a muffler system I purchased off Ebay.
I really don't think there is a difference in the Ebay mufflers for 1997-1999 Boxsters and 2000-2004 Boxsters.
I paid about $300.00 for mine (including shipping) and a muffler shop installed it in about an hour. The only issue was that the mechanic had to wait for the OEM exhaust system to cool down before taking it off.
The Ebay muffler sounds great, it weighs considerably less than the factory muffler and my rear trunk doesn't get as scorching hot as it used to. A win, win in my opinion.
MNC-I
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