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In California, you can not modify the catalytic converters in a vehicle and still pass emissions testing(visual in particular). I know this doesn't apply to ALL vehicles, but it most certainly does apply to ALL FR-S/BRZ. As the cat is an integrated component of the header, this means you effectively have no options for an upgraded header while still being compliant with emissions laws.
That said, swapping the header takes about an hour and our vehicles get a pass on emissions testing for 5 years after purchase date(maybe manufacture date, but I think purchase). I would take the enjoyment of the upgrades for 4-5 years and swap back when the time came.
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