
92-96 UK/WRX/STI/RA Std 220-275 BHP (on UK fuel)
Level 1 290-300bhp Full Decat or Sportscat exhaust from turbo back 2.5 or 3” bore Walbro 255 l/hr uprated fuel pump Apexi Induction system with resonator delete ESL custom live mapping of original ECU Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge NGK PFR 7B uprated spark plugs Uprated dump valve such as Sard or Forge motorsport
Level 2 310-330bhp
Full Decat or Sportscat exhaust from turbo back 2.5 or 3” bore Walbro 255 l/hr uprated fuel pump Apexi Induction system with resonator delete ESL custom live mapping of original ECU NGK PFR 7B uprated spark plugs High Flow multi spray fuel injectors 550cc (380cc std) Front mount intercooler MY 97 –00 map sensor (higher pressure rating)
Level 3 360-390bhp
Full Decat turbo back 3” bore Tubular exhaust headers and flow matched uppipe Walbro 255 l/hr uprated fuel pump Apexi Induction system with resonator delete High Flow multi spray fuel injectors 550cc Front mount intercooler MY 97 –00 map sensor (higher pressure rating) NGK PFR 7B uprated spark plugs AFP 05-20G custom ported turbocharger complete with intake feedpipe Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge Stand alone SimTek fully mapable ECU with twin maps, permitting use of different fuels or octane booster and elimating the MAF sensor which is limited to approx 350 bhp on this model.
Note Level 3 power may shorten the life of the transmission system this will depend on use and driving style. On high mileage cars level 2 may reduce transmission life.
Level 4 390-410 bhp
Full Decat turbo back 3” bore Tubular exhaust headers and flow matched uppipe Walbro 255 l/hr uprated fuel pump Front mount intercooler MY 97 –00 map sensor (higher pressure rating) Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge Stand alone fully mapable SimTek ECU with twin maps, permitting use of different fuels or octane booster and elimating the MAF sensor which is limited to 350 bhp NGK PFR 7B uprated spark plugs Custom cold air induction system High Flow multi spray fuel injectors 740cc AFP 321H custom turbocharger with fitting kit
Level 5 420-450 bhp
Full Decat turbo back 3” bore Tubular exhaust headers and flow matched uppipe Walbro 255 l/hr uprated fuel pump Front mount intercooler MY 97 –00 map sensor (higher pressure rating) Fuel Lab turbo specification fuel pressure regulator with fitting kit & gauge Stand alone fully mapable SimTek ECU with twin maps, permitting use of different fuels or octane booster and elimating the MAF sensor which is limited to approx 350 bhp on this model NGK racing 8 spark plugs Custom cold air induction system High Flow multi spray fuel injectors 740cc AFP 321T custom turbocharger with fitting kit Map sensor upgrade to 3 BAR
Note We do not recommended level 4-5 with standard internals, clutch or gearbox. As a minimum 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 01- 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.
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