Cobb Stage 1 + Redline Carbon Fiber Power Package - Subaru STi 2015-2021 / STi Type RA 2018EMISSIONS 50 State Legal. This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer's application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number: D 660 61 WHY? Want the world's best selling, most flexible ECU upgrade solution along with COBB's Redline Carbon Fiber Intake System to increase air flow? Start here, down the modifying road