Blythe CA does not require smog. Never has. I don't live there but I do however run DC headers, test pipes and pride V1. Every year when my registration comes in...smog exempt. The caveat is you cannot have a PO Box. Also, all out of state cars coming in for first time registration must pass smog. Without divulging a step by step process to circumnavigate the smog requirements, hopefully you can fill in the blanks. For me it is worth not having to deal with all the BS for a car I use once a month, if that. I believe there are other cities that have this same "loophole" (although it really isn't). DMV should have the list but just running a google search produced 18 counties that don't require smog. Screw it, here is the list of required smog counties (scroll half way down)
http://www.dmv.ca.gov/vr/smogfaq.htm. It has everything to do with population size. If you are registered in a rural area there is typically no smog requirement. Most people don't realize that smog ISN'T a state requirement but a regional requirement. Ultimately, if you can't get around having to smog there are always other avenues but in my experience you'll likley only find them via a face to face conversation.
Hope this helps.
Nick