I have a 99 2wd 4runner with appx 262K miles on it.
in 2018 NOx was around 0.9 GPM, the max in CO is 2.0 GPM.
2020 rolls around and i have to restest.
Test 1: NOx = 2.082 = fail

Test 2: NOx = 2.27xx = fail
before the test I
--Premium gas
--replaced air filter
--cleaned MAF
--ran seafoam through it

Test 3:NOx = 2.17xx = fail
before the test I
--Ran Guaranteed Pass in tank
--replaced upstream O2 Sensor
--replaced cracked air filter to throttle body boot
--half tank premium gas ran through before the test and tested with less than 1/4 tank

Not sure what else to try aside from a new cat.
Any suggestion on a direct fit replacement?
All the other levels are good

Thanks