cc, flat 4 cylinder,
speed manual AWD
bhp @ 5900 rpm
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
The Impreza WR1's extra power and torque are achieved thanks
to a revised engine control unit (ECU), high-flow catalyst and
Also fitted to the WR1 is a drivers 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.