The BMW 4-Series is available in two different body styles: coupe and convertible. There are two engines available in the 4-Series: 430i models are powered by a turbocharged 2.0L four-cylinder engine that makes 255 horsepower. Power is sent to the rear wheels via an 8-speed automatic transmission, while a 6-speed manual is available. The performance-oriented M4 gets a 3.0L twin-turbocharged six-cylinder. It produces an impressive 473 horsepower and 406 lb-ft of torque. The M4 Competition uses the same engine mated to an 8-speed automatic transmission that's tuned to produce 503 horsepower. M4 models are rear-wheel-drive only. The M440 is available in RWD and AWD and it's powered by a 3L turbocharged 6-cylinder engine that produces 382 horsepower. Trim levels are all similarly equipped across the range, notable features on the 4-Series include 18-inch alloy wheels, LED headlights, heated side mirrors with a power folding function, 12-way power adjustable front seats, a leather-wrapped steering wheel, Bluetooth connectivity, a automatic climate control with separate rear controls, BMW's iDrive system with an 8.8-inch display screen, cruise control and rain-sensing wipers. The M4 comes with a few more standard items, such as adaptive suspension, touch-screen navigation, and a 16-speaker surround audio system. Since the various trims feature similar equipment levels, there are several options and option packages available on the 4-Series. Available safety equipment includes front and rear parking sensors, a lane departure warning system, blind spot warning, forward collision mitigation, rear collision warning, a pedestrian detection system, a driver attention alert and a traffic sign information system.