The biggest update for 2012 happens under the hood, where BMW has done away with the naturally-aspirated in-line six-cylinder engine of the previous Z4 sDrive30i and replaced it with a turbocharged 2.0-liter four-cylinder in the new Z4 sDrive28i. The Z4 sDrive35i retains its 300-horsepower turbocharged 3.0-liter in-line six, and the Z4 sDrive35is packs 335 horsepower from a twin-turbo in-line six-cylinder. Despite the downsizing, the new turbocharged four-cylinder provides nearly as much horsepower (240 hp) and a bit more torque than its predecessor. Paired with the six-speed manual transmission (an eight-speed automatic is available) it’s a fun, smooth-driving car with a nice little turbo kick in the mid-range. The sDrive35i comes standard with a six-speed manual transmission as well, with an option upgrade to a seven-speed dual-clutch unit, which marries the connected driving experience of the manual with the comfort and ease of an automatic. The dual-clutch is standard on the sDrive35is.