Starting in 2011, rules for WRC cars changed to be more restrictive. New regulations were derived from Super 2000 cars with a different aerodynamic kit. The cars could be smaller models (there was no longer a minimum 4 m length) and include a custom-build or production 1600 cm3 direct injection turbo-charged global race engine with a diameter air restrictor and a maximum boost pressure of absolute. This limited torque to about or lessFor instance, officially the Citroën DS3 WRC has at 3,250rpm.).
