Looks like a tune may be in order
You have reached the 3 air mod limit before a tune is almost required to run correctly, this is common where there are multiple codes being thrown because of adjustments to intake and exhaust. the tune will also smooth out those shifts and the air/fuel ratios so that misfire can go away, or at least they can tell you why its happening
I will also receive a catalyst code when running long distances at constant speeds, but has ever affected anything
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2012 370z 7AT- ES2 with PSS, K&N Drop-ins, LED's all around, Berk HFC, FI CBE non-res, KW V1's
2003 A4 5MT- The Beater
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