COBB USDM Accessport V3 (AP3-SUB-004) – 2015–2021 Subaru WRX / STI

The COBB Accessport V3 is the most proven, flexible, and user-friendly engine management upgrade for the 2015–2021 WRX and STI. Flash performance maps in minutes, monitor critical engine parameters like a full-feature gauge package, and log data for safe, consistent performance whether you’re running basic bolt-ons or a full custom build.

The V3 Accessport features a large, full-color high-resolution display that can show up to six live gauges at once. It’s fully customizable with different layouts (street, race, dyno), interchangeable faceplates, and mounting options that work with thousands of common vehicle mounts.

USDM vehicles only. Please verify vehicle compatibility before purchase.

Subaru Accessport Features & Details

CLICK HERE FOR MAP NOTES, DYNO CHARTS AND POWER GAINS

Accessport Manager: Use your PC or Mac to manage maps, download recorded datalogs, or quickly update your Accessport. Download free from right HERE.

Key Features

• Simple ECU Flashing + Gauge Package: Flash maps and monitor live data in one device.
• Large Full-Color Screen: Higher resolution display with up to six live parameters.
• Customizable Layouts: Create street/race/dyno gauge clusters to match your use.
• More Processing Power: Faster flashing with expanded memory and storage for maps/logs.
• In-Vehicle Mountable: Designed to be mounted in the cabin with an on/off switch.
• Interchangeable Faceplates: Change the look with multiple bezel/faceplate options.
• Supports OTS Maps or Custom Tuning: Follow COBB staged upgrades or tune for any mod level.

Why We Like It

If you own a 15–21 WRX or STI, the Accessport is the foundation of a properly managed setup. It’s not just about peak power it’s about control, monitoring, and consistency. Whether you stay on COBB OTS maps or work with a pro tuner, this is the tool that makes it all possible.

Subaru-Specific Features

• Realtime Tuning: Make changes while the engine is running to speed up the tuning process and adjust features like Launch Control, Flat Foot Shift, and map switching (availability varies by model).
• Adjust Idle: Change idle speed on the fly to support lightweight flywheels or upgraded cams (separate A/C ON and A/C OFF settings).
• Adjust Timing (STI Only): Globally reduce timing to compensate for poor pump fuel.
• Flat Foot Shifting: Keep the throttle down during shifts to maintain boost with a configurable RPM setting.
  • Not available for WRX CVT.
• Launch Control: Set an RPM threshold for performance launches and boost building.
  • Not available for WRX CVT.
• Launch Mode (Forester XT & WRX CVT Only): Manipulates factory torque limiters to build boost for launching (where supported), with driver-controlled activation.

Emissions

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-660-16
• D-660-43

Important Notes

• Warning: Installing this Accessport over anything other than OEM or COBB software may result in ECU/TCU failure. Contact COBB Support if you have questions about your vehicle’s current calibration.
• Use the correct map for your exact vehicle, fuel, and modifications.

What’s in the Box

• COBB Accessport V3 (AP3-SUB-004)
• COBB OTS maps (pre-loaded, per COBB package contents)
• Required cables and mounting components (per COBB kit contents)

Compatibility & Disclaimers

Designed for USDM 2015–2021 WRX/STI models as listed. Always confirm your ECU has OEM or COBB software before installation. Emissions legality depends on using the product per COBB’s application guide and your local regulations.