COBB Tuning Stage 1 Power Package – 2002-2005 Subaru WRX

Cobb Stage 1 Power Package — 2002-2005 Subaru WRX

The Cobb Stage 1 Power Package for the 2002-2005 Subaru WRX combines the Cobb Accessport V3 with a high-flow drop-in air filter for the original GD-generation EJ20 platform. Cobb has been developing calibrations for the EJ20 since the first WRX arrived in North America — the OTS maps for this platform reflect the full depth of that development history.

DETAILS

• Includes: Cobb Accessport V3 + high-flow drop-in filter
• Platform: 2002-2005 Subaru WRX EJ20 MT
• OTS maps: 91 octane, 93 octane — EJ20 specific, two decades of development
• High-flow filter: drop-in for factory airbox — no plumbing changes
• Accessport live gauges: boost, AFR, IAT, coolant temp, and more
• Accessport data logging for ProTuner custom calibration
• NOTE: Ships via UPS/FedEx — signature required at delivery

Two Decades of EJ20 Calibration Development

The 2002-2005 GD WRX EJ20 is the platform that established Cobb’s Subaru tuning program — the original Accessport was developed extensively on these cars, and more than two decades of refinement have produced an OTS map library that reflects genuine engineering depth rather than quick adaptation. The EJ20 factory calibration carries the same conservative approach as all OEM turbocharged calibrations — meaningful margin built into ignition timing advance, boost targets, and fueling for market fuel quality and operating condition variation. On quality 93-octane fuel in consistent conditions, the Accessport’s OTS map reclaims that margin: timing advances to what the EJ20 can reliably support, boost targets move toward the stock turbo’s actual capability, and fueling tightens to what the sequential injection system can deliver. The improvement is immediately noticeable in throttle response from the first tip-in and in how confidently the EJ20 pulls through the mid-range.

Drop-In Filter, Live Gauges, and Diagnostics on the Original GD

The high-flow drop-in filter improves airflow in the factory EJ20 airbox without modifying intake plumbing or MAF sensor location. The Accessport gauge display provides real-time performance monitoring the early GD WRX factory instrumentation never offered — boost pressure, wideband AFR, intake air temperature, coolant temperature, and other parameters visible simultaneously on the Accessport screen. Data logging captures all of this at high speed for ProTuner review, and the Accessport handles OBD-II diagnostic code reading for the occasional fault code these older cars generate.

What’s in the Box

• Cobb Accessport V3
• OBD-II cable
• USB cable (to PC)
• 2 interchangeable Accessport faceplates
• Universal in-vehicle mount
• OTS maps — pre-loaded and ready to flash
• High-flow drop-in air filter

Why Choose Cobb Tuning

Cobb Tuning has been developing performance software and hardware for turbocharged enthusiast vehicles since 1999. Founded in Austin, Texas, Cobb built its reputation on the Accessport and expanded into a full catalog of hardware engineered to complement it. Every OTS map is developed in-house on real vehicles, and every hardware product is validated as part of a complete system — not sourced and sold in isolation. That integrated approach is why Cobb produces consistent, reliable results across the builds we see every day.

The RallySport Take

The 2002-2005 WRX is increasingly valued and carefully maintained. The Accessport V3 brings modern hardware — color screen, fast flash, expanded storage — to OTS maps developed over two decades of Cobb EJ20 work. For any early GD WRX owner who wants their EJ20 calibrated correctly, this is where it starts.

Fitment

Year	Make	Model	Notes
2002-2005	Subaru	WRX	EJ20 MT