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That is an aftermarket header, with what looks to be a catalytic convertor. It looks like a P&L equal length header with cat to me, but I'm no expert.
You may be getting the catalyst efficiency code due to the aftermarket cat
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2013 FRS
Vortech V3 11psi
Revworks UEL - PLM Overpipe - MOTIV catted frontpipe - Invidia Q300
2019 Series.Grey STI - Stage1+ SF
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