The 2004 Impreza WRX STi WR1 was first unveiled at the 2004 ‘Autosport’ motor show, the Prodrive-developed ‘WR1’ received official Subaru (UK) engineering approval after recording the best performance figures ever for a road-going UK-spec Impreza - at that time.

Peak power for the Impreza WRX STi WR1 is 320 bhp at a relatively low 5,800 rpm, with a maximum torque output of 309.8 lb/ft at 4,000 rpm.

The Impreza WR1's extra power and torque are achieved thanks to a revised engine control unit (ECU), high-flow catalyst and sports silencer.

Also fitted to the WR1 is a driver’s control centre-differential (DCCD) via a switch mounted next to the handbrake. This allows the torque distribution between front and rear wheels to be manually selected. This allows the choice, for example, between a sharper cornering turn-in or more stable straight-line running. The system defaults to ‘automatic’ mode whenever the ignition is restarted.

Also new for the ‘WR1’ are special, Prodrive-developed uprated springs and bump-stops with a 25 mm lower ride-height.

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