The Stealth had a similar issue. They key was to really let it warm up and actually get the cat hot before smogging it. If I drove it for a full half an hour or so beforehand, it passed with flying colors. If I just drove it the 2-3 miles from the house to the smog place it was way over...
The key to passing the sniff test is to have a fully warmed up car.
Heck, the guy I sold to had no problem passing CA smog with it warmed up, and it only has a single high flow cat compared to 3 restrictive ones stock...
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I am a Commodore PET --- Now get off my lawn you kids...
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