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This is pretty remarkable, @California98Civic. If I ever think I need a new cat, I'll definitely try this. My truck is failing smog right now; High NO ppm was fixed by fixing my exhaust manifold and gaskets, but that brought the HC ppm up too high, so I'm hoping a tune-up will fix that. It's been too long since I did plugs, checked the wires, and cleaned the mass airflow sensor.
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