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The boxster, as you probably know, was 2 sets of cats. Technically you could resort to a single header design and reroute the O2 sensors to the secondary cats. Keep in mind, the secondary cats are just as restrictive (and maybe more if they' share the same part as a 996) as the primary cats. With that said, there's really nothing to be gained as far as performance is concerned. As I've said numerous times in the past, there's no short cut or inexpensive way to improve upon the oem exhaust system .
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Don't worry … I've got the microfilm.
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