When introduced in 2003, the BMW Z4 sports roadster entered the marketplace with big shoes to fill. The Z4 replaced the popular BMW Z3 as a more refined interpretation of two-passenger sports car riding. The 2003 model year vehicle was offered with a 184-horsepower 2.5-liter engine as well as a more potent 3.0-liter powerplant generating 225-horsepower. Three transmission options could be equipped on the 2003 BMW Z4 with a five-speed manual, five-speed automatic and a five-speed SMG (Sequential Manual Gearbox) was available. Tailored to performance, the two-seat interior also invoked a sense of luxury with power mirrors and a standard 10-speaker stereo system. In 2006, a permanent roof coupe model joined the BMW Z4 roadster. Also in for the 2006, a high-performance M version of the Z4 was introduced. Energized by a 3.2-liter inline-six engine also used to power the BMW M3, the 330-horsepower Z4 M featured some subtle styling enhancements. Acceleration from 0 to 60 miles per hour was accomplished in as little as 4.8 seconds behind the wheel of the BMW Z4 M. The Z4 M and the coupe model were discontinued when a second-generation model of the two-seat sports car came to dealerships. Along with sharpening some of the bodylines and increasing base engine power to 255 horsepower, the 2009 redesign would also feature an all-new retractable hardtop roof. High intensity discharge headlights, cruise control and rain-sensing windshield wipers were standard on the base Z4 30i roadster. From 2002 to 2008, the BMW Z4 was manufactured in Greer, South Carolina. The production of the second-generation model was moved to Germany. In 2012, the base six-cylinder engine of the BMW Z4 was replaced with a more fuel-efficient turbocharged 2.0-liter inline-four.