From Ford press: From Ford The Ford Focus receives major design and engineering improvements for the 2005 model year. New for 2005, a Focus ZX4 ST performance sedan has been added to the lineup. This sedan marries chassis components from the SVT Focus with a 151-horsepower, 2.3-liter Duratec 23 I-4 engine.
Focus is built in Wayne, Mich. and Hermosillo, Mexico. The 2005 Focus benefits from the Ford’s "Revolution Under the Hood" – a massive undertaking that began about four years ago to improve powertrain performance, refinement, fuel economy and emissions.
Ford estimates the 2005 Focus fleet will produce 32 percent fewer smog-forming emissions than its 2004 fleet. At the same time, base horsepower will rise 23 percent, and fuel economy is expected to improve by 7 percent.