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!.
ECU(All except 3 litre )Can not be reflashed or tuned for any improvement, zero value here, ECU is a old design and inherently allows no improvement.
Unless you have MASSIVE mods, and or a custom build engine the same applies to ECU above.ZERO VALUE
NEW ECUAs the engine is relatively high comp, there is very little to gain here. OK if you want to invest over $4000 in a motec or similar ECU then you will get some advantages, but frankly, for this $$ you are better investing it elsewhere!
INJECTORSBigger injectors empty your wallet and add no power. Save your $$ for suspension and get some GOOD improvements.
EXHAUST(All Except 3.0 and 3.6)Engine pipe with long secondary pipes to add torque is the only value, 5 - 15 kw and up to 50 Nm can be gained, with the correct complete design.WRX systems barely fit and only reduce back pressure and engine response with no increase in power.A free flowing exhaust from cat back will sound louder but add no power.
AIR INTAKEOther than a horrible intake noise no power here either. MRT used to supply and fit ram pod style intakes, but with technology and recent testing and on the later models these were made redundantA replacement panel filter in the std airbox will save on future servicing but give no power improvement.
ENGINE ANCILLIARIESItems such as aftermarket plug leads, high capacity discharge ignition systems etc all will ad very marginal if any improvement.
TURBOOK if you have big bucks a turbo upgrade will add power, but really, why not just buy a WRX!To turbo the NA engine you need a minimum $7000 to do a half decent job and still its not where near like a WRXInternal engine mods are then needed for reliability.6 CYLINDER ENGINESIf you want big grunt and big torque then ok, this is an option here, but, remember the engine isssion and 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.
ENGINE INTERNALOK 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.
OTHER OPTIONSIs the car serviced correctly because often a service by a workshop who really knows subarus will be your best place for power.
SUSPENSIONcheck 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 http://mrtperformance.com.au/performance/suspension
FREE CHECKRefer the MRT vehicle service section here and take advantage of our free 78 point check to ensure your car is in top shape!
Mazda Upgrades, click here for more info