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The Smog Guide Blog

New posts on California smog check rules, the parts that fail, and what the state's own numbers say. For the long reference pages, see all guides.

November 14, 2026How to Pass Smog With Aftermarket Parts in CaliforniaWill your intake, tune, exhaust or engine swap pass a California smog check? What the inspector checks, how to look up a CARB EO number, and what to do if you fail.