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!.

Typically this car in Australia is “Mitsubishis secret”, it was NEVER imported by RalliArt in limited numbers and only available recently as a higher volume grey import model.
The MR is damn near a EVO IX except has no VVT cams.
The Oz Model EVO VIII and the Jap spec model vary hugely in power and reliability.
There are some great features of this car, 4wd, turbo and most of all, a sensible budget with some well planned upgrades and it turns a great car into a great super car beater!

(All Japanese models)
Can be converted and fully tuned, using EcuteK Software for almost any improvement, ECU is similar design as previous EVO models back to EVO 6 and allows solid results with correct settings and allows good improvement.
If the car has been run on the wrong fuel (Jap MR models are tuned for 100 Ron) then the ECU will have detuned it more and a retune on 98 will make more power, more reliably.
AND the big issue is also the engine can be running super high ignition or lean fuel mixtures that can result in high power with LOW reliability
Dont underestimate the incredible improvement with a good ECU retune.

Bottom end and mid range performance can be dramatically improved with ECU tune. The engine is detuned by Mitsubishi and also power limited due to emisions requirements when delivered by the factory.
Poor boost control with the factory standard settings can be annoying.
Boost maps, can be improved.
(Engine does not have VVT cams like EVO 9 model)
Car should be run on 98 Ron Fuel unless a custom (ecuteK) map is done.
The factory turbo is reliable, but if over boosted with boost controllers etc will result in wasted power and an indirect effect on poor ignition.

On this model the aif flow meter sensor is very reliable
Depending on model, Jap spec or Oz the twin rear exhaust O2 sensors if located incorectly related to modified exhaust can cause problems, if old can also dull the cruise performance of the car and increase fuel use.
Crank, cam  and Knock sensors are reliable, but with age can fail. 

Not worth considering as the intercptors simply do not have enough options to tune and modify the latest technoplogy control inputs.

NEW (replacement) ECU
Factory ECU retune is best value unless a really serious engine rebuild is chosen.
See notes above

Factory fitted unit is good, dont fit a replacement FRONT mount.

Bigger injectors empty your wallet and add no power unless part of a E85 fuel retune or major engine rebuild.
Save your $$ for suspension and get some GOOD improvements.
OEM Injectors are big enough unless you do a major engine rebuild.

More than adequate up to 20 kw at the wheels after that a 500 hp pump can be retofitted

(Some traps for people here, unless carefully chosen.)
Turbo engine pipes with collector to fit wastegate will help marginally, but costly to fit and will add some throttle response.
High flow ceramic or better, a metal cat in the downpipe is best.
A factory Flex joint back exhaust (with a newer larger diameter flex joint) is best value, with correctly located O2 sensor.
Get this wrong and the car will suffer CEL lights, and cause poor fuel economy.
The rear muffler adds no value in just replacing it and should be completed as a part of a whole “flex back” exhaust kit..

Other than a intake noise no power here.
The positive intake pressure with the factory intake is best kept in place.
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.
A GFB alloy crank pully is available and will result in snapp/ier throttle response.

If you have the budget a (bigger) turbo upgrade will add (peak) power, but be careful the OEM turbo is damn good and very hard top beat and is best kept in place unless you have the right other parts to match a new turbo upgrade
As the limit becomes close to the engine needing other supporting parts such as larger injectors and results in a peaky power outputand will give no value unless you plan carefully.
(meaning if you fit a bigger turbo you can use its benefits but be careful as the extra boost will need to be tuned carefully )
If you want big grunt and big torque then ok, this is an option here, then you need to plan a engine rebuild or be wary of the resulting load on the engine.

Like above if you have a solid budget, then a rebuild will give some great and huge benefits, the engine is a very very good package and flows great HP and is very tough. A rebuild will cost over $7k and then you need to choose carefully there are many options, but only if you REALLY want to.

Is the car serviced correctly? Because often a service by a workshop who really knows Mitsubishi’s will be your best choice for first place for power and reliability.


  • Upper engine cleaner and in tank fuel additive. (when was this last done, as often the Jap import cars have huge carbon build up).
  • 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 this car, I would invest some of my budget in the MRT XB kit and then 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 the O2 sensor
  3. Check brakes
  4. ECU upgrade and re tune.
  5. New brake pads and discs if needed
  6. Front and rear sway bars.
  7. Complete (quality) exhaust.
  8. Front and rear sway bar links


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