The hardcore Subaru Impreza WRX STi Spec C has been homologated for use in rallying.

The Spec C is a lightweight, toughened-up homologation special, created with the car's competition use in mind.

Read our Subaru Impreza WRX STI Spec C test drive

The Spec C has the same power and torque outputs as Japan's potent 2.0-litre WRX STi - 304bhp and 311lb ft - but it gets a new, high-response twin-scroll turbocharger and a reprogrammed ECU to boost mid-range thrust.

An extensive round of weight saving has cut out 30kg, and the chassis gets stiffer springs, dampers and bushes (up by 15 to 30 per cent).

There's a more rigid front crossmember and a thicker rear anti-roll bar too.

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