I'm running a sports cat on mine with jgm map, never had any issues with emissions. Although my dad recently failed emissions with all standard cats on (apart from up pipe as Sti). Turned out to be dodgy air/fuel sensor which was then over compensated by the ecu.
My point is I guess you could blame a dodgy sensor for the high roadside reading even if you had cats on. Even by plugging in they may not be able to determine if it is the lack of cats or a dodgy sensor.
Muddy waters now....
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