It's not your cat that's killing your mileage, I would guess at something in your fuel delivery system. Or it could be something with your ECU. If your turbo is stock/cali model it'll have 2 cats, one in the DP, one between the DP and the cat back. If it's standard US it'll just have the one between the DP and cat back. If you plan on replacing the cat, get a high-flow cat, it'll make the turbo spool faster and it'll still be street legal (and you should still be able to pass smog)
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