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The COBB Tuning Accessport V3 AP3-SUB-004 is the industry-standard ECU tuning solution for modern turbocharged Subaru platforms. Designed specifically for select USDM Subaru WRX, STI, and Forester XT models, the Accessport V3 unlocks the true performance potential hidden within the factory engine calibration. From improved throttle response and stronger mid-range torque to smoother power delivery and enhanced drivability, this device transforms how your Subaru performs on the street or track.
At its core, the Accessport V3 is a powerful ECU tuner and monitoring tool. It allows you to install COBB’s professionally developed Off-The-Shelf (OTS) maps in minutes, or load custom calibrations created by professional tuners. These maps optimize boost control, ignition timing, fuel delivery, and torque management to safely extract more power from your engine while maintaining reliability when used as intended. You can use the pre-loaded OTS (off the shelf) maps to tune your vehicle for Cobb parts only. If you have a mix or other brands of parts installed that are not COBB, we can custom tune your WRX or STi remotely through our e-tuning service. There will be an option on this page to purchase an etune with your COBB AccessPORT SUB-004.
Beyond tuning, the Accessport functions as a comprehensive engine management display. Its large, full-color, high-resolution screen can be mounted in-vehicle to display live data such as boost pressure, air-fuel ratio, ignition timing, intake air temperature, knock feedback, and more. Data logging capabilities allow you to record and analyze vehicle performance, diagnose issues, and fine-tune your setup with precision.
Whether your Subaru is completely stock or equipped with performance upgrades, the Accessport V3 is the foundation for every successful tuning path. It is trusted by enthusiasts, professional tuners, and motorsports teams worldwide due to its reliability, ease of use, and proven performance gains.
The Accessport V3 delivers significant and measurable performance improvements by optimizing factory ECU parameters. While exact gains vary depending on fuel quality, vehicle condition, and supporting modifications, typical results reported across Subaru platforms include:
Note: Actual results will depend on fuel octane, altitude, environmental conditions, and the specific tune used. For maximum performance and safety, custom tuning is recommended for heavily modified vehicles.
The Accessport flashes your vehicle’s ECU with performance-oriented calibrations that improve power, drivability, and responsiveness. It also functions as a monitoring, diagnostic, and data-logging tool.
Yes, when used with appropriate maps and proper fuel, the Accessport is designed for daily driving. COBB’s OTS maps are engineered with safety margins for reliable operation.
Yes. The Accessport allows you to uninstall the tune and restore the factory ECU calibration at any time.
No. The Accessport works on completely stock vehicles using Stage 1 OTS maps. Additional modifications are optional and supported with the correct tuning.
Absolutely. The Accessport is the most widely supported tuning platform in the Subaru community and is compatible with custom dyno tunes and e-tunes.
ECU tuning may affect warranty claims related to the power-train. Warranty determinations are made by the vehicle manufacturer or dealership on a case-by-case basis.
Yes. It includes a built-in diagnostic trouble code reader and can clear most engine-related fault codes.
The device must be unmarried (uninstalled) from the current vehicle before it can be installed on another compatible vehicle.
COBB Tuning provides a 12-month limited warranty covering defects in materials and workmanship for the original purchaser. The warranty does not cover damage caused by misuse, improper installation, unauthorized modifications, or physical damage. Proof of purchase is required for all warranty claims.
Warranty and return policies may vary by retailer. Always retain your receipt and consult the seller for specific return eligibility.
NOTE: THIS IS NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY EMISSION CONTROLLED MOTOR VEHICLE. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending. Once testing is complete with California, and an EO number is issued, this product will be updated to 50-state legal status.
Warning! Installation of this AccessPORT over anything other than OEM or COBB software may result in ECU/TCU failure. Please contact COBB Support if you have any questions.
CLICK HERE FOR COMPLETE MAP NOTES, DYNO CHARTS AND POWER GAINS!!!
SKU:COBBAP3-SUB-004 ,UPC: ,Availability:
