Volvo's racing and performance partner, Polestar, has revealed this hardcore version of the C30.
The car has been commissioned by Volvo to see what Polestar could achieve "when racing engineers and designers get free hands to build a street car without any limitations set by a specific racing regulation".
Polestar - which helped Volvo to win the Swedish Touring Car Championship with a C30 last year - has fitted a larger turbo and intercooler to the car's 2.5-litre T5 engine to boost power to 399bhp and torque to 376lb ft. Other engine modifications include modified pistons, inlet camshaft and conrods.
The Volvo C30 Polestar Performance Concept Prototype uses a Haldex all-wheel drive system and a Quaife mechanical differential. Upgraded springs and dampers have also been fitted, while the steering rack has been made more responsive with a quicker ratio.
Large Brembo brake discs are fitted front and rear and the car rides on 19-inch black alloys with Pirelli P Zero tyres. Interior upgrades include racing leather seats with a four-point harness, while the car features an aerodynamic kit developed from the STCC racer.
The car is on show from today at the Gothenburg motor show.