As reported, the DS4 Racing Concept is powered by a tuned version of the 1.6-liter turbocharged engine found in many of the PSA Peugeot-Citreon group models and which was developed in conjunction with the BMW Group.
In the DS4 R concept, it puts out a whopping 256 HP ? that's 160 HP per liter, which Citroen says is a record for a mass-production car. At the same time, despite its high output, CO2 emissions are just 155 g/km.[...]