Chevrolet WTCC Ultra: Exciting Driveable Race car Concept - Muscular: Strikingly fresh design, outside and in - Powerful: 190 hp common rail diesel - Efficient: Modern lightweight materials Paris.  "It’s a wild thing": The Chevrolet WTCC Ultra has got what it takes to be the star of the Paris Motor Show – and not just because its rear spoiler shoots so brashly up towards the heavens. The bold and aggressive design of the racecar study takes…