SMOG question posted by ChrisZTT(Sacto, CA) on April 26, 2022 at 04:25 PM
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At first I tested it a day after putting the cats in with only about 5 miles on them and it failed. Took it out and put some miles on it, heated them up real well. Retested afterwards and it passed with flying colors. HCO and NOx dropped to like 9 each and CO was basically non existent.