California Smog Guide
California has some of the toughest rules for vehicles in the United States. The CARB (California Air Research Board) is the governing body that oversees environmental factors for the state including vehicle emissions. Swaps are not always allowed and can get you in trouble with authorities, or even have your car impounded or crushed. Before you change out your engine, be sure you understand what you can and cannot do from a legal perspective. Some of these links will help inform you of the process.

California blank map
Angr, CC BY-SA 3.0 <Creative Commons — Attribution-ShareAlike 3.0 Unported — CC BY-SA 3.0>, via Wikimedia Commons
- Database: Aftermarket Parts Database of Executive Orders
- Aftermarket, Performance and Add-On Parts
- HYBRID: HYBRID vs. the Smog Referee
- HYBRID: CA Smog REF
- EPA : http://www.epa.gov/otaq/imports/quikover.htm
- DOT : http://www.nhtsa.dot.gov/cars/rules/import/
- US customs : http://www.customs.ustreas.gov/xp/cgov/import/
- http://www.honda-tech.com/showthread.php?t=853679
- NorCal CRX Club
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California Air Resources Board - Wikipedia
en.wikipedia.org
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