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Gut the cats and buy two of these in the link below, put them in the downstream O2 holes and thread your O2 sensors into them and call it good. Aupoko Straight O2 Oxygen Sensor... https://www.amazon.ca/dp/B07F2Y8VMK?ref=ppx_pop_mob_ap_share
Why do they think you need new cats? Do you have any noise on acceleration? In drive, park or neutral? I only ask cuz I have a noise on my driverside front only under rpm load ... it's not manifold bolts or lifters so was curious if that should be my next step ... catless would be the cheaper route.. and could just have the codes tuned out
