I will be registering my highly modified ZX Turbo in Houston in the next month or two..so I will let you know...this car has zero emissions parts on it, no EGR, no cat, no charcoal canister...and so it will be interesting to see how that goes!
As an aside I know for a FACT because I checked with the local DMV (Harris County where I live)...that if you drive your car LESS than 5,000miles per year, your car is 20+ years old and fail the smog test twice you can ask for a waiver.
Hope this helps.
Yasin