The Z4 is offered in three trim levels: sDrive28i, sDrive35i and sDrive35is. The 28i gets a turbocharged 2.0-liter inline-4 that produces 240 horsepower and 260 pound-feet of torque. That's less power than the old base six-cylinder, but it's more torque, and fuel economy is substantially improved. Besides a rather agricultural noise at idle, this is a sweet little engine. If it's not enough, however, the 35i comes with a twin-turbocharged 3.0-liter inline-6 good for 300 hp and 300 lb-ft of torque. Both cars have a six-speed manual transmission as standard, while the 28i gets an automatic stop/start system. An eight-speed conventional automatic is optional on the sDrive28i, while the optional transmission for the sDrive35i is a seven-speed dual-clutch automated manual (DCT). The 35is gets a revised version of the regular 35i's engine, boasting 335 hp and 332 lb-ft of torque with a temporary overboost function that pumps torque up to 369 lb-ft. DCT comes standard.
Source: http://www.edmunds.com/bmw/z4/
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