Reviving this thread - we now offer two CARB-compliant turbo kits:
WORKS FR-S/BRZ Stage 2 Turbocharger Kit - CARB Compliant
WORKS FR-S/BRZ Stage 1 Turbocharger Kit - CARB Compliant
Like @
mav1178 said, the compliance process requires significant R&D investment to ensure emissions compliance, as well as hiring an independent lab to put the vehicle through a number of tests and drive cycles. The lab then sends the test data to the Air Resources Board, who issues an Executive Order (EO) number if the test data shows the added equipment does not increase emissions.
Our kits retain both factory catalytic converters, contains hardware and software that passed these tests, and displays our EO number for reference during SMOG inspections.
More info can be found
here and
here.