Supported Vehicles:

• Model year 2008-2014 STI (North American, ADM Spec)

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Fuel Requirements:

Each map lists the minimum required octane. A higher octane fuel can be used safely on a map designed for lower octane. DO NOT use maps designed for higher octane with lower octane fuels. Top Tier gasoline should be used where available.

• Maps designated with "93" are for use with 93 octane fuel (98 RON) or better.

• Maps designated with "91" are for use with 91 octane fuel (95 RON) or better.

• Maps designated with “ACN91” are for use with 91 octane fuel found in Arizona, California, and Nevada or better.

These maps are designed for E10 fuel (fuel with 10% ethanol content). For those who only have access to E0 fuel (fuel with 0% ethanol) it is recommended to use the "91" octane version of the maps and datalog the car to ensure your fuel is performing to the necessary level. This is especially important for those using Canadian 94 octane E0 fuel. 

Stage 1 & 2

Hard Parts Configuration

C.A.R.B Note

The above calibrations (Stage1, Stage1+FF, NexGen Stage2 1050x) are legal for use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer's application guide because it and the parts have a California Air Resources Board (CARB) Executive Order (EO) number: 

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• D-660-16

• D-660-17

• D-660-99

For additional information on CARB EO availability or the actual letter. Please check out our page CARB EO numbers for COBB Subaru ProductsPreview

NexGen Stage2+Flex Fuel

NexGen Stage2+FF Gains

NexGen Stage2+Flex Fuel

• Intake Requirements:

  • COBB SF Intake+Airbox 715300

  • COBB Turbo Inlet 712450

  • COBB Throttle Body Coupler 712455

• Exhaust Requirements:

  • Stock Downpipe

  • Catback Exhaust

    • Factory Cat-Back

    • COBB Stainless Catback 515122

    • COBB Titanium Catback 515140

• Subaru Spark Plugs 2018 Type RA/2019+ STI spec. D44700

• Fuel System Upgrades

  • COBB NexGen Flex Fuel Kit (2 parts) 315260, 315670

  • COBB Fuel Pressure Sensor Kit 315650

  • COBB 1050x Injectors 312150

  • COBB Billet Fuel Rails 343150

  • COBB Fuel Line Kit 343250

  • COBB Fuel Pressure Regulator Kit 315250

  • AEM In-Tank Fuel Pump 315450

• Boost Targets

  • ACN91 (Arizona California Nevada 91Octane): ~18psi peak boost pressure tapering down as you approach the redline, +/- 1.5psi.

  • 91 Octane 95 RON Minimum: ~19psi peak boost pressure tapering down as you approach the redline, +/- 1.5psi.

  • 93 Octane 98 RON Minimum: ~19psi peak boost pressure tapering down as you approach the redline, +/- 1.5psi.