Again you are comparing your old mr2 bro, Mikes car passed without a EGR, every car is VERY diffrent, Yes EGR is made to control NOX, but what I was saying you cant say its the main problem with a emission test , I dont want people reading your comment and directly going to spend money fixing there EGR and then there car fails...and with Micheals car I was saying when a CAR FAILS EVERY reading many times for me it is the CAT.. but not the case with his car becuase he already changed it...

and Brandon only a difference of 600 eh, A lot of cars that need a Cat fail at the same reading, and once that cat is on it is usually under 400 NOX, but that was not the case with your mr2, If I recall did it come with a EGR ? I dont think so but im not sure, If you had put the EGR first and tested it with no cat, I Garuntee you would've got the same Readings