Short answer - no, long answer - yes. The only way is to build your own as a kit car. In some states as long as it's road worthy they'll let you register it. At least in my state and probably in California, it has to meet all emissions standards.
In addition, importing the car would cost more than any possible fuel savings.
You could register it as an off road or show car.
The only way that I think you could do it is to swap the engine yourself and not tell anybody. As long as it can pass emissions and all the computer diagnostics work at the emissions testing station they would never know.