Referring to a number of vehicles built by
Ford and tuned by Cosworth for the purposes of touring
car or rally racing. Most notably among them are the Sierra and Escort Cosworth RS's, which featured the turbocharged 2.0L Cosworth YB series of engines, famed for their tunability.
These vehicles were made in somewhat limited quantities available with
5-speed manual tranismissions in RWD or AWD with a particular rear-wheel bias. Though they were sold primarily in Europe, a handful were exported to
America as the Merkur XR4Ti, essentially a rebadged Sierra Cosworth RS; the Cossie Escort was
never sold in the US.