After releasing a sketched teaser image at the beginning of the month, the Swedish automaker has now revealed the Volvo C30 Polestar Performance Concept.
There is still only one photo available with the Volvo C30 Polestar Performance Concept but the car can be seen in the flesh at the Gothenburg Motor Show from April
The Volvo C30 Polestar Performance Concept uses a 2.5-litre engine with a large intercooler and KKK 26 turbochargers that has also received modified pistons and is now able to produce 405 horsepower and 510 Nm of torque.
Other improvements made by the company’s racing engineers and designer include new shock absorbers, better steering, performance brakes from Brembo, BBS FI rims wrapped in Pirellli P Zero tires while at the interior the  Volvo C30 Polestar Performance Concept received Racing seats covered in Ternsjo leather.
Volvo press release :
Premiere for concept car from Volvo Cars’ official Racing and Performance Partner
This weekend Volvo Cars and Polestar enter their fifteenth consecutive motorsport season in the Swedish Touring Car Championship (STCC) as reigning champions. But even before the racing cars exit the pit for the weekends’ first practice session, Polestar now present the ultimate Volvo car for the street.
Main objective with the Volvo C30 Polestar Performance Concept Prototype is to explore what happens when racing engineers and designers get free hands to build a street car without any limitations set by a specific racing regulation.
Polestar has a long and successful competition history with Volvo, racing with 850, S40, and S60. In 2009, Polestar won the STCC for Volvo Cars with the C30, a car they developed completely from scratch.
The close relationship between Polestar and Volvo Cars in testing and development has lead up to Polestar receiving the responsibility to develop Polestar Performance Engine Optimization Products as a complement to Volvos standard cars.
These products are sold through Volvos dealers on several markets and are the only engine optimizations for Volvo cars covered by Volvos original warranty and where the certified fuel consumption and emissions remain unchanged.
With the Volvo C30 Polestar Concept Prototype, Polestar aimed to build further on the strong driving characteristics of the standard C30 and at the same time illustrate the link between the racing cars and the Polestar Performance products.
The car is based on Polestars unique experience from developing the Volvo C30 into a winning race car. The interior and exterior design reflects Polestars know-how on the C30’s aerodynamic and driving properties derived through several years of development and testing – from computer simulations, to wind tunnel and race track testing.
The car will premiere for the public at Gothenburg Motor show April 22-25.
Polestar C30 Performance Prototype Technical Specification
Volvo T5: 2.5L Turbo with larger intercooler and KKK 26 turbo
Modified pistons, conrods and inlet camshaft
Power Output: 405 hp. Torque: 510 Nm
Quaife mechanical differential brake front and rear
Haldex AWD
Öhlins shock absorbers and springs
More responsive steering rack with 2,25 ratio
Front: Brembo 380mm discs with six piston calipers
Rear: Brembo 330mm discs with four piston calipers
Rims and Tires:
BBS FI 19×8,75"
Pirelli  P Zero 235/35 ZR 19
Racing seats with Ternsjö leather and four point harness
Aerodynamics derived from the STCC race car

Source: Volvo