Ok so I thought id try and pass my car on the emission's test in colorado, so it passes everything but the nox,(it failed by .467 i ran that gaurteed to pass higher reading on nox by 1.458, I paid 500.00 last year in parts and 300 this year in installation of new cat new center muffler and end muffler. they cant get the egr it's discontinued, and the carberator on it sounds like its misfiring now, what do you guys suggest once again 1983' civic hatchback (bullet) ?