Subaru has revealed the ultimate incarnation of the current Impreza, the S207, at the Tokyo Motor Show.

Limited to just 400 units, sadly all for the Japanese domestic market only, the S207 is the latest in a long line of special edition STIs that lift the WRX’s performance to supercar-baiting levels.

The 2.0-litre turbocharged flat-four found in Japanese-market STIs (and the motorsport-only NR4 locally) benefits from engine balancing and a new intake, exhaust, ECU and twin-scroll turbocharger to lift outputs from 227kW/422Nm to 241kW/431Nm.

Subaru -WRX-STI-S207-rear

The chassis has undergone an even more extensive transformation. There’s bracing for the front strut towers and front and rear subframes, as well as pillow-ball bushing for the rear lateral suspension linkages.

Subaru -WRX-STI-S207-suspension

Bilstein dampers all ’round (adjustable at the front) combine with a quicker 11:1 steering rack and front-to-rear torque vectoring system to provide more grip and sharper responses, at which point you’ll be glad of the Recaro front bucket seats.

Subaru -WRX-STI-S207-interior

The S207 is available in blue, white or black, with 100 NBR Challenge cars available in yellow. Converted from yen, the S207 starts at A$69,159.40, while the NBR Challenge will set you back A$72,897.74, or $73,520.80 if you want it in yellow.