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In Europe the OE headers are already catless. We only have the cats in the mid section. They're normally 400cell but most 'sport' cats are 200 or 100 cell. I've tried lots of permutations of exhaust set up on the 550 I now have but haven't bothered to Dyno test any as I did all that on my previous Boxster.
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Porsche Boxster S
Porsche Boxster
Threaded Mode
