Your Vehicle
Subaru WRX 2.5 STi 300hp
Technical Specifications
Power and torque increase
Stage 1: software remap only, no mechanical changes, fully reversible.
Stage 1: file 100 € online + installation 700 € at the workshop (on the bench) Book now
Power HP
Torque Nm
Buy the Stage 1 file, pay the installation at the workshop
100 € VAT included: the file developed for your engine, paid online
Installation: 700 € network price, the workshop may charge less, paid at the chosen workshop (on the bench) · terms
Power Graph
Subaru WRX 2.5 STi 300hp: da 300 a 330HP
Remapping Subaru WRX
MasterTuning develops remapping for Subaru. La Subaru WRX 2.5 STi 300hp può passare da 300 HP a 330 HP con un incremento di 30 HP.
The development of each remap is customized by MasterTuning.
- 100% customised files with lifetime warranty
- Reference values for Stage 1: the file is developed on your vehicle and checked in the workshop
- Best performance, within safety margins
- Reduced fuel consumption
ECU Remapping Details Subaru WRX 2.5 STi 300hp
The Subaru WRX 2.5 STi 300hp is equipped with a petrol engine that produces 300 HP and 407 Nm of torque in its factory configuration. With MasterTuning's professional ECU remapping, this Subaru can achieve 330 HP (+10%) and 467 Nm (+15%).
Our Stage 1 tuning for the WRX 2015 - 2017 delivers an impressive gain of +30 HP and +60 Nm, optimizing the petrol engine's performance while maintaining reliability and staying within safe parameters.
The engine code EJ25 identifies this specific powerplant configuration. The Denso SH7058 GW / Hitachi SH72543 ECU is professionally recalibrated to unlock hidden potential while preserving engine longevity.
With 300 HP from factory, this Subaru WRX is already a performance vehicle. Our remapping extracts even more potential, delivering exhilarating acceleration and enhanced driving dynamics for enthusiasts who demand the best.
Technical Specifications — Subaru WRX 2.5 STi 300hp
Factory technical data for the Subaru WRX 2.5 STi 300hp (2015 - 2017), used by MasterTuning engineers to develop a remap tailored to this specific powerplant. Figures shown are reference values for Stage 1; the file is developed on your vehicle and checked in the workshop.
| Engine code | EJ25 |
|---|---|
| ECU / Control unit | Denso SH7058 GW / Hitachi SH72543 |
| Fuel | Petrol |
| Compression ratio | 8.2 |
| Bore × stroke | 99.5 X 79.0 mm |
| Stock power | 300 HP · 407 Nm |
| Remapped power (Stage 1) | 330 HP (+30) · 467 Nm (+60) |
Don't want to touch the ECU?
Rapid Dimsport add-on modules connect to the engine sensors with original connectors: they fit in a few hours and come off without a trace, leaving the factory software untouched. Useful on a leased car, one still under warranty or one you plan to sell soon. Check which ones fit your Subaru WRX.
Frequently Asked Questions - Subaru WRX
How much power can I gain from remapping my Subaru WRX?
With MasterTuning Stage 1, your Subaru WRX 2.5 STi 300hp can gain +30 HP (from 300 to 330 HP) and +60 Nm of torque. This represents a 10% increase in power.
Which ECU does the Subaru WRX 2.5 STi 300hp use?
The Subaru WRX 2.5 STi 300hp uses the Denso SH7058 GW / Hitachi SH72543 engine control unit. MasterTuning recalibrates this ECU for Stage 1 and Stage 2.
What is the engine code of the Subaru WRX 2.5 STi 300hp?
The engine code of the Subaru WRX 2.5 STi 300hp is EJ25. You can find it in the vehicle documents or on the engine plate.
Is ECU remapping safe for the Subaru WRX engine?
Yes, MasterTuning's remapping for the Subaru WRX 2.5 STi 300hp is developed within safe parameters. Each file is developed on your vehicle, checked in the workshop and stays within the mechanical limits of the EJ25 engine.
Is the Subaru ECU remapping reversible?
Absolutely. The original factory calibration of your Subaru WRX is always backed up before remapping. The process is 100% reversible at any time.
Will remapping affect my Subaru warranty?
ECU remapping may affect your manufacturer warranty. We recommend checking your specific warranty terms. Many of our customers choose to remap after the warranty period or accept this trade-off for the significant performance gains.
Other Remaps You Might Like
Other Engines Subaru WRX 2015 - 2017
Similar Power Subaru
Book your remap or ask for a quote
Stage 1 can be bought online and is done at the workshop you choose; for Stage 2 we send you a quote.
Stage 2 is quoted on request: write to us and we will reply with price and timing.
Request Quote on WhatsAppYour data is safe. No spam, just your quote.