The California DSO (71 or 72) triggered the 88 only mass airflow sensor. The 88 CA mass air has a different shaped plug than the 50 state 89 and later part that is oval in shape.
As far as I know, the smog process is no different than the regular process for passing smog. Depending where you live, the test process may be more stringent. Bay Area and Los Angeles areas have ‘enhanced’ testing standards, meaning the car has to be tested on a smog chassis dyno.
On cats, you have two options. OE 4 cat midpipes or the California compliant unit from Magnaflow.
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