2004 Subaru Impreza S203

The S203 combined a stronger engine specification with an unusually refined interpretation of the STI complete car. STI’s heritage catalogue places it in 2004 and records 555 units, giving the model a defined identity beyond a normal Impreza with upgraded wheels or seats.

The heritage date is the public reference used here

The factory heritage record lists S203 under 2004. This profile preserves that reference without implying that every car was built, registered and delivered during the same calendar year. Those dates should remain distinct in an individual vehicle file. The S203 identity is the named complete model described by STI, rather than the earlier display concept sometimes photographed under the description Impreza Produced by STI.

STI: Impreza S203 heritage and specification

Engine development belongs to a coordinated package

The published specification gives a 1,994 cc EJ20 with 235 kW or 320 PS and a six-speed manual transmission. A higher output figure is only one part of the model’s engineering story. Its significance is the relationship between power delivery and the rest of the complete vehicle. For a surviving example, record the original engine specification and subsequent rebuild or calibration work separately, avoiding an unsupported claim that a decades-old car still produces its exact launch figure.

A measured exterior supports the premium brief

STI describes specially developed aerodynamic elements rather than relying on a radical wide-body transformation. As design analysis, the S203’s distinction becomes clearer when its front treatment, rear spoiler and wheels are read together. Isolated accessories can be fitted to ordinary GDB cars, so those parts are corroborating evidence rather than a substitute for factory identity. The exact installation and any replacement parts should be recorded in dated photographs.

STI: Impreza S203 heritage and specification

The seating is a particularly useful specification detail

The factory identifies RECARO seats with dry-carbon shells as part of the model’s equipment. Such distinctive removable objects deserve their own condition and provenance records. If they have been changed, the car’s original complete-model identity may remain documented, but its present completeness needs a qualified description. A generic seat carrying the same maker’s badge is not automatically equivalent in structure, fit or original specification.

STI: Impreza S203 heritage and specification

Use a production-car photograph rather than the show precursor

The selected image is catalogued as an actual S203, avoiding the available photographs of an earlier concept presentation. This is a small but important distinction: developmental styling can resemble the final car while differing in seats, trim or intended status. For an individual collector file, connect the original chassis record with the complete specification, special equipment and service history. The heritage programme figure should not be multiplied by concept appearances or later registrations.

Specifications and identity reference

Rarity and production scope

STI’s heritage specification gives 555 S203 units. This is an attributed complete-model programme reference, not a new chassis audit, a total for all GDB Imprezas or a current-survivor count. The 2004 heritage reference is distinct from an individual registration date. Earlier concept photographs are not substituted for the final named model, and present originality still requires car-specific evidence.

What the photograph represents

A photograph catalogued as the S203 production model. It is not the earlier Impreza Produced by STI concept, which has separate available exhibition photographs.

Related Subaru profiles

• 2002 Subaru Impreza S202 STI Version
• 2006 Subaru Impreza WRX STI spec C Type RA-R
• 2011 Subaru WRX STI S206

Frequently asked questions

Is Impreza Produced by STI the same photographic subject?

It is a developmental display identity. This package uses a photograph specifically catalogued as the S203 production model.

Can the special seats prove the entire car is genuine?

They support identification, but removable equipment must be connected to the original vehicle records.

What is the production-count boundary for this profile?

STI’s heritage specification gives 555 S203 units. This is an attributed complete-model programme reference, not a new chassis audit, a total for all GDB Imprezas or a current-survivor count. The 2004 heritage reference is distinct from an individual registration date. Earlier concept photographs are not substituted for the final named model, and present originality still requires car-specific evidence.

Sources and further reading

1. STI: Impreza S203 heritage and specification

Research checked 19 October 2026. Linked manufacturer heritage pages, factory announcements, official distributor publications and labelled contemporary coverage support the specifically identified claims. Photographic descriptions identify the illustrated subject. Design analysis and suggested authentication steps are editorial interpretation.