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it is illegal ....in ca to remove or alter the cat.
There are two tests
1. the actual emission test for output
2. a visual ispection based on the year and model of the vehicle
I had a 66 mustang 6 cylinder with a new 200 ci engine. the car had a CA serial number so required an air pump on the intake manifold. the new engine didnt have so I failed the smog test. btw, the emmsions were 10% of the allowable. didnt matter. failed the visual.
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