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New Tuning File Available: Subaru Impreza WRX STI 2.5L Turbo Stage 1 + Decat ECU Tuning File – Denso 4D42594006 A8DK100Z 4D425 - Stage 1 + Decat remap for Subaru Impreza WRX STI 2.5L Turbo – enhanced boost and free-flow power on Denso 4D42594006 ECU
Welcome to the official discussion thread for the Subaru 2.5L Turbo tuning package. This calibration is specifically developed for the 4D42594006 ECU and optimized for maximum reliability.
Target Performance: 280.0PS / 205.9KW.
Share your experience!
Have you flashed this file? Drop your dyno graphs, 0-100 times, reviews, or ask any technical questions below!
➜ Download Tuning File / View Full Specs
Discussion & Reviews: Subaru 2.5L Turbo#
Welcome to the official discussion thread for the Subaru 2.5L Turbo tuning package. This calibration is specifically developed for the 4D42594006 ECU and optimized for maximum reliability.
Target Performance: 280.0PS / 205.9KW.
Share your experience!Have you flashed this file? Drop your dyno graphs, 0-100 times, reviews, or ask any technical questions below!
Extended Product Information#
- Stage 1 + Decat tuning for Subaru WRX STI 2.5L Turbo (Denso ECU 4D42594006)
- Catalytic converter delete calibration for improved exhaust flow
- Boost maps optimised for stronger low- and mid-range torque
- Ignition and fuel maps reworked for performance and safety
- Throttle response sharpened without compromising drivability
- Includes clean Stage 1 with catalytic support and Decat variant
- Compatible with Alientech Kess V2 — OBD flashable
- Checksum corrected — no editing required
- Delivered as full binary: Original + 2 tuned versions
- Track-tested and validated on dyno
➜ Download Tuning File / View Full Specs
