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i had a catco cat in my hatch and had a hard time passing smog. I have i/h/e with msd upgrade. The first time i took the test fail it then a second time pass barely. Then two yrs later i failed twiced and when i show someone the results they told me they bet it was the cat not operating correctly. They said to me 1 of 3 options, first being cat is burn out, second being the cat is not getting hot enough for smog more lean then rich, third was that some people do not realize if you ask for a high flow cat make sure its a three way cat not just a two way cat. The two way cat does not burn as much as the three way cat plus it doesnt help with nox. I hope this help:sun:
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