The BMW X4 comes in two basic guises: X4 xDrive28i and X4 M40i. The xDrive28i is powered by a turbocharged 2.0L 4-cylinder engine that produces 240 horsepower, while the M40i utilizes a twin-turbocharged 3.0L 6-cylinder engine producing 355 horsepower. In both cases, power is sent to all four wheels via an 8-speed automatic transmission. The X4 further sets itself apart from the X3 with a unique interior featuring very nice materials and high quality construction throughout. The ride height is lower than in the X3 and it offers drivers a more classically coupe-like view throughout the greenhouse. Handling has been improved over the X3 as well, with the X4 doing some serious sports car-like performance on winding roads, thanks to a lower ride height and aggressively tuned suspension. The X4 comes nicely equipped with both xDrive28i and M40i versions getting a very similar set of amenities. Standard equipment includes 19-inch wheels, power adjustable front seats, a powered glass moonroof, advanced vehicle and key memory, a powered tailgate, rear parking sensors, rain sensing wipers, dynamic cruise control and a 9-speaker stereo with satellite radio with an optional Harman/Kardon surround system. The "M Sport" package is now available on both xDrive28i and M40i models. This package significantly changes the exterior of the X4, with the M Sport line deleting various chrome bits and adding more aggressive, body colored exterior enhancements. The M Sport line also includes unique 19-inch or 20-inch wheels, Dynamic Damper Control, an "M" steering wheel, metallic exterior paint, and a few interior styling tweaks. Safety is enhanced by a full complement of electronic aids as well as by several airbags. Other safety features include a hill start function as well as a mode for descending slippery slopes.