If it passes inspection, it is not letting through any undesirable chemicals.
Incidentally, my car is over 10 years old, Dec '91. When doing my test, I went to the garage to check the emissions before getting any nasty surprises. It was as clean as a whistle. The 3 cats do a very good job.
Wish Subaru/Fuji had been as thorough with the tranny.
Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing
Betty
Jersey Girl Silver '92 UK [Channel Isles] 40K
Jersey Girl @ Mersea
Candy Purple Honda Blackbird
Plum Dangerous
White X2 RVR Mitsubishi 1800GDI.
Vantastic
40,000 miles Jersey Girl