We get many calls for upgrades on this model, as a guide to assist you we have created this list to save your time, guarantee your money is invested correctly and most of all give you maximum value!.

This can be retuned however the engine runs very high compression and even running it on 98 ron fuel the engine still suffers excessive combustion pressure and with the timing in the factory map it pings!
The only benefit for a reliable tune is drivability, dont expect ANY tune to give reliable Kw’s
refer our dyno data here for information and samples

Unless you have MASSIVE mods, and or a custom build engine the same applies to ECU above.

As the engine is relatively high comp, there is very little to gain here.
For this $$ you are better investing it elsewhere!

Bigger injectors empty your wallet and add no power. Save your $$ for suspension and get some GOOD improvements.

WRX systems barely fit and only reduce back pressure and engine response with no increase in power.
3.0 litre engine
The H6 6 cylinder engine sounds horrible with even custom, hand made exhaust manifolds, believe us we have tried this!
zero value for Kw in this area as well

Other than a horrible intake noise no power here either.
A replacement panel filter in the std airbox will save on future servicing but give no power improvement.

Items such as aftermarket plug leads, high capacity discharge ignition systems etc all will ad very marginal if any improvement.

OK if you have big bucks a turbo upgrade will add power, but really, why not just buy a WRX!
If you want big grunt and big torque then ok, this is an option here, but, remember  you can only run very low boost. if you want Grunt with this engine and a huffer, then you need to plan a engine rebuild.

OK like above if you have wads of cash, then a rebuild will give some benefits, but a rebuild will cost over $5k and then you need to choose carefully.

Is the car serviced correctly because often a service by a workshop who really knows subarus will be your best place for power.


  • Upper engine cleaner and in tank fuel additive. (when was this last done, its a subaru suggested option).
  • Good quality low friction engine oil such as Mobil 5 w 30 will give around 5 kw and better fuel economy over a non synthetic oil.
  • Fuel system service, MRT offer this and often get good results, cleans the EGR “gunk” out of the intake and combustion area.
    Also injectors as well as inlet manf and exhaust as well as fuel pump, lines and sensors.
  • Synthetic trans and diff oil, again like engine oil this adds up in benefits.
  • Timing belt, fuel filter are again areas that should be checked and renewed.

check out the performance / suspension section for REAL gains and benefits.
If I owned a NA suby, I would invest my budget in brakes and suspension as this is guaranteed BEST VALUE!
more here https://mrtperformance.com.au/performance/suspension

Refer the MRT vehicle service section here and take advantage of our free 78 point check to ensure your car is in top shape!


  1. Check service history.
  2. Check brakes
  3. New brake pads and discs if needed
  4. Front and rear sway bars.
  5. Positive shift kit for 6 speed models


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