The 2010 BMW Z4 sees no major changes following its redesign for the 2009 model year. Z4 seats 2 and comes as a convertible with a power-retractable hard top. Z4 comes in two trim levels, each with a 3.0-liter inline 6-cylinder engine. The sDrive30i has 255 horsepower, while the sDrive35i is turbocharged and has 300 horsepower. Both have a standard 6-speed manual transmission. A 6-speed automatic