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Top » Catalog » Subaru » WRX STI 2014-on » Turbo » Stage1.5STI » Stage 1.5 Performance Tuning Package Subaru WRX STI 14-on EJ25

Tuning Developments Stage 1.5 Performance Tuning Package for the Subaru WRX STi 2014 onwards with EJ25 engine.

Tuning Developments have developed this package on our own 2014 Subaru WRX STi, having picked up the vehicle in standard form; we set about getting some baseline runs of the car on our in-house Dyno Dynamics 4WD dyno. The results were impressive, making 296hp and 308lb.ft torque. A promising start.

We then set about looking to make improvements. We have fabricated our own in house turbo back exhaust system which is available in both resonated and non resonated variables. Our particular vehicle uses the resonated system for quieter exhaust volume when cruising and on the motorway and so forth, yet gives off the classic Subaru boxer rumble when you start pressing on the throttle. We decided to use 3” tube throughout the system as to aid air flow as much as is possible. This also future proofing the exhaust should much higher power outputs be a consideration for the future.

Along with this our Stage 1.5 package uses our custom designed high flow cold air intake system to remove the factory airbox allowing much higher airflow at high rpms which really shows in engine performance above 5000rpm. The cold air intake (CAI) has our custom designed maf location for optimum performance along with our air box panel to keep any hot engine bay air away from the air filter to ensure the intake only picks up cool air providing much improved intake air temperatures allowing for more consistent high power levels.

Our Stage 1.5 remap brought power up from 296hp stock upto 354hp as peak increases, not a bad increase. However throughout the mid range we’re actually seeing an increase of 60hp over the standard car! Torque figures are up from 308lb.ft to a mighty 370lb.ft which really does transform the drive of the Subaru WRX STi. Dyno graphs below show the vast power output difference from the standard car to the Tuning Developments Stage 1.5 Package trim.

Included in the Tuning Developments Stage 1.5 Tuning Package

‘Before’ Dyno Run Session
3” Stainless Steel Turbo Back Exhaust System – WRX STi
Tuning Developments High Flow Cold Air Intake System – WRX STi
GFB Go Fast Bits Respons TMS Adjustable Recirculation Valve WRX STi
Gaskets – WRX STi
ECUTeK License – WRX STi
In-House Remap Using ECUTeK With RaceROM Suite – WRX STi
‘After’ Dyno Run Session Incorporated With Above Remap

As with all of our bespoke in house exhaust systems, they come with a lifetime warranty for added peace of mind.

To sum up:

Stock: 296bhp & 308lb.ft
Stage 1 : 329bhp & 370lb.ft
Stage 1.5: 354bhp & 370IB.ft

See our upcoming tuning packages from Tuning Developments for further power hungry owners, whereby we will be adding more hardware in order to unlock more power from your Subaru WRX STi. Stage 2 and Stage 3 Packages are well in development stages and will be released shortly and this will be updated to suit !

This product was added to our catalog on .