Mike,
You can't delete the cats on a 2.5 without triggering a CEL by virtue of the fact there's only one set of cats for that model boxster. By eliminating them, the vehicle will be render catless, and therefore you'll have to re-map the ecu in order to get rid of the CEL. The potential loss in low to mid range torque is another discussion.
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Don't worry … I've got the microfilm.
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