Ladies and Gentleman.
Start Your Engines.
Wait! According to California, you can only use engines that are certified to meet air-emission standards, have a current “Executive Order,” and have not been tampered with, OR engines that are used solely for competition (but not every competition) and are not used on public highways (is a dirt road a public highway?).
Sound complicated? The Clean Air Act provides racing vehicles a broad exemption from federal air emission standards and also provides for broad preemption of state motor vehicle standards, with specific exceptions for California. In addition, California has its own broad racing vehicle exemption which can be found in the California Health and Safety Code. The exemption for racing vehicles seemed straightforward enough—they are not subject to federal or state emissions standards. This exemption makes sense, of course, because when you are racing, you need enhanced engine capabilities to win and because racing engines are a small percentage of the engines we see on the road for everyday use, such as commuting to school/work, running errands, etc.