97-98 STI 3 & 4, JDM WRX , 22B  Std 260-280 bhp (on UK fuel)

Level 1 Std car UK fuel Map (original JDM map is for 100 octane fuel) 290-300 bhp

Standalone Apexi Power FC Fully Mapable ECU with 4 x Boost/Power settings in-car adjustable  

Level 2 310-330 bhp

Full Decat or Sportscat exhaust from turbo back 2.5 or 3” bore
Walbro 255 l/hr uprated fuel pump
Apexi panel filter with resonator delete
Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge
Standalone Apexi Power FC Fully Mapable ECU with 4 x Boost/Power settings in-car adjustable  
NGK PFR 7B uprated spark plugs


Level 3 370-400 bhp

Full Decat turbo back 3” bore exhaust system.
Tubular exhaust headers and flow matched uppipe
Walbro 255 l/hr uprated fuel pump
Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge
High Flow multi spray fuel injectors 550cc (440cc std)
STI V7/8 TMIC & matching undertray     
0r
Front mount intercooler
AFP 05-20G custom ported turbocharger
Apexi Induction System
Standalone Apexi Power FC Fully Mappable ECU with 4 x Boost/Power settings in-car adjustable 
NGK PFR 7B uprated spark plugs


Level 4 400-420 bhp

Full Decat turbo back 3” bore exhaust system
Tubular exhaust headers and flow matched uppipe
Walbro 255 l/hr uprated fuel pump
Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge
STI V7/8 TMIC & matching undertray     
0r
Front mount intercooler
Custom cold air induction system        
High Flow multi spray fuel injectors 740cc
AFP 321H custom turbocharger with fitting kit
Standalone Apexi Power FC Fully Mappable ECU with 4 x Boost/Power settings in-car adjustable
Custom Cold Air induction kit
NGK PFR 7B uprated spark plugs

Note The V3-4 Sti Gearbox is stronger than the UK or previous versions however Level 4 + Power may shorten the life of the transmission this will depend on type of use

and driving style


Level 5 430-460 bhp

Full Decat turbo back 3” bore exhaust system
Tubular exhaust headers and flow matched uppipe
Walbro 255 l/hr uprated fuel pump
Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge
STI V7/8 TMIC & matching undertray     
0r
Front mount intercooler
Custom cold air induction system        
High Flow multi spray fuel injectors 740cc
AFP 321T custom tubro charger with fitting kit
Stand alone fully mappable SimTek ECU with twin maps, permitting use of different fuels or octane booster
and elimating the MAF sensor which is limited to approx 420 bhp on this model 
Map sensor upgrade to 3 BAR
NGK racing eight spark plugs

Note We do not recommended level 5 on standard internals, clutch or gearbox. As a mimium we recommend forged pistons
and steel rods, steel head gaskets and uprated clutch. We also recommend either a PPG gear kit or 6 speed gearbox conversion ( from later STI) 

PLEASE NOTE 

We have included the tuning section us a guide to what we consider to be the most cost effective steps during tuning. This has been compiled with the benefit of experiencing hundreds of upgrades. There are other parts/turbos that can be substituted but the listed parts we have found to give the most consistant results over many installations.

Your own ideals may vary depending on the parts you may currently have fitted.

Our suggested levels are compiled to mimise incompatible components, it is not ideal to fit a turbo that your fuel system cannot support for example,

We do not do parts fitting here so I can't give you a full price, the components in the tuning stages are listed in order to allow you to select the most cost effective route to power and in turn allow us to achieve the best results from your car.

Our core business is ECU Custom Mapping and Hybrid turbocharger design/building. We are not here to try and sell you the parts with the biggest profit margin, we can however supply (for local collection or mail order) all the tuning parts listed if required. Optionally you can source them yourself or arrange for the garage doing the fitting to supply them. The individual parts prices can be found on the website on their respective pages

We can recommend specialist garages within a 100 mile radius that work with us on a regular basis to fit the parts if required. These garages have been specially selected as places that are very experienced specifically with Subarus and work on a daily basis with this type of car. We recommend them as we know they will look after your car and their attention to detail will ensure maximum reliability. It is perfectly safe to have the parts fitted and then drive to us off boost (this still allows cruising at 70mph) for final setup and custom mapping. We have had cars drive over 400 miles to have this done.

Predicted BHP figures are approximations, our section on “rolling roads” explains in some detail why it is impossible to give exact figures.