The "original equipment specifications" for early Elios will not have turbos as options. California may balk at approving such retrofit kits. California has tried to get old muscle cars off the road and succeeded for a while.Excellent points.
But. If Elio had "original equipment specifications", for an Elio Turbo, I do not think I would need a "BAR" label, as long as it did not "degrade the effectiveness of a vehicle's emission control system."
CA is probably the most stringent of all.
https://www.bar.ca.gov/Industry/Engine_Change_Guidelines.html
I have lived here 32 years.
I live in California. I know California. I do not trust California.