Engine

• The 2006 Ford Focus ZX4 ST was powered by a Duratec 137.975-cubic-inch (2.3 liter), dual overhead cam engine with 16 valves. The aluminum block motor featured electronic fuel injection. Its bore and stroke was 3.44 inches by 3.7 inches, with a compression ratio of 9.9:1. It produced 151 horsepower at 5,750 rpm with 154 pound-feet of torque at 4,250 rpm.
  
  

Chassis, Transmission, Brakes

• The ZX4 came with a five-speed manual transmission with a final drive ratio of 3.82. It featured MacPherson strut independent front suspension with a stabilizer bar. The rear independent suspension was a Control Blade multi-link type with a stabilizer bar. The braking setup featured a 10.2-inch vented discs on the front with rear eight-inch drums. The ZX4 employed power rack-and-pinion steering.
  
  

Dimensions

• The Focus ZX4 sedan measured 175.2 inches long, 66.7 inches wide and 56.9 inches tall, with a 102.9 inch wheelbase. Its curb weight was 2,738 pounds. It had a front track of 58.9 inches, with a rear track of 58.7 inches.