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Official details of the "Concept 4 Series" were released in December 2012, detailing the intention to replace the E92 3 Series coupé with a new 4 Series line. In 2013, the concept vehicle (called the Concept 4 Series Coupé) was unveiled at the North American International Auto Show. The concept car was designed by Won Kyu Kang.

Compared with its E92 predecessor, the F32's wheelbase is 50 mm (2.0 in) longer, the overall length is increased by 31 mm (1.2 in) and the width is increased by 44 mm (1.7 in).The front track width is 1,545 mm (60.8 in) and the rear track width is 1,593 mm (62.7 in), increases of 45 mm (1.8 in) and 80 mm (3.1 in) respectively.

The BMW 4 Series Coupe marks the beginning of a new era for coupes at BMW. Launched as the latest generation of BMW’s sporty mid-size Coupe, the new BMW 4 Series Coupe embodies the very essence of dynamics and aesthetic appeal in the premium segment. The “4” in its title headlines this new product line for the Coupe and emphasizes not only its stand-out design, but that any way you look at it, the new 4 Series Coupe represents something more than its BMW 3 Series cousins – 3+1, if you will. At the same time, as a true BMW Coupe, the new nomenclature brings the new BMW 4 Series Coupe in line with the larger 6 Series and 8 Series Coupes.

The new BMW 4 Series Coupe will be offered as both a 428i, featuring BMW’s award-winning TwinPower Turbo 2.0-liter 4-cylinder and as a 435i with the multi-award winning Twin Power Turbo 3.0-liter inline six. Both will be available with a standard 8-speed sport automatic or six-speed manual transmission. Both will also be offered with a choice of rear-wheel drive or with optional xDrive, BMW’s intelligent all-wheel drive system. The 2014 BMW 428i Coupe will have a base MSRP of $41,425, and the 2014 BMW 435i Coupe will have a starting price of $46,925. Both prices include destination and handling. The 2014 428i xDrive Coupe and 435i xDrive will start from $43,425 and 48,925 respectively, again inclusive of destination and handling.

The new BMW 4 Series Coupe is visibly larger in width and wheelbase than the outgoing BMW 3 Series Coupe, and its stretched silhouette sits considerably lower to the road. This, together with its BMW-typical short overhangs, long hood and set-back passenger compartment with flowing roofline, give the BMW 4 Series Coupe a visual balance. The car’s striking front end – with its characteristic BMW design features, such as the double-kidney grille, four round headlights and a large air intake in the front apron – is keen to display its family ties with the BMW 3 Series. New elements of the BMW 4 Series Coupe are the Air Breathers, which are positioned rearwards of the front wheel arches to reduce drag. The Coupe’s muscular wheel arches and wide track give an aggressive stance, with its prominent horizontal lines.

The interior of the BMW 4 Series Coupe presents a combination of sporty allure and exclusivity. All the controls central to driving are arranged ergonomically around the driver ensuring comfortable access to all functions. In the rear compartment, contoured seats continue the sporty theme of the BMW 4 Series Coupe. Recessed head restraints and broad, continuously molded side supports give the rear bench the appearance of two individual seats. High-grade material combinations and finish quality accentuate the premium feel of the new BMW 4 Series Coupe. Customers can choose the Sport or Luxury Lines as alternatives to standard specification. M Sport is another alternative. All three allow visible individualization of the car’s exterior and interior appearance.

The defining characteristics of the new BMW 4 Series Coupe are its driving dynamics and aesthetics. As always, BMW engineers have placed special focus on steering accuracy, precision, linear control response, and agility to fortify the new BMW 4 Series Coupe as the latest shape of The Ultimate Driving Machine. Sophisticated chassis technology, near-perfect 50:50 weight distribution, fine-tuning in the wind tunnel, and lightweight construction all contribute to meet that goal.

The front suspension of the new BMW 4 Series Coupe combines maximum stiffness with minimum weight. Aluminum torque struts, wishbones and swivel bearings bring a reduction in unsprung weight. At the same time, the engineers optimized the kinematics of the double-pivot suspension for agility and precision. Adjusting the position of the control arms in the swivel bearings from their arrangement on the latest BMW 3 Series Sedan gives the car a .7-inch (19-mm) lower roll center, which has a positive effect on driving performance. An additional strut between the front axle subframe and body sill creates a stiffer overall connection between the front wheels and the car’s main structure, so the transverse forces generated on entry into corners are transferred to the car more directly. The BMW 4 Series Coupe responds more directly to the driver’s steering commands and displays more sporty characteristics and greater agility. And that means it carves through corners with ease and precision.

The rear axle of the new BMW 4 Series Coupe is a key component in its driving characteristics, but that does not mean comfort has been overlooked. This construction is based on the five-link concept, and its elastokinematics have been tuned specially for this sports coupe. In addition, extra-wide mounts and supports on the wheel carriers for track and camber, slightly repositioned pivot points, stiff control arms and suspension subframes, and the use of thrust arms to connect the suspension with the body all provide an excellent basis for an extremely sporty and dynamically exceptional overall set-up. The result is precise and assured wheel location, directional stability in any driving situation. Aerodynamic features around the rear suspension also contribute to driving precision.

Driving Experience Control switch with ECO PRO mode: extra-sporty or efficient driving modes at the touch of a button.

The new BMW 4 Series Coupe also offers drivers the ability to change between sporty, eco or comfort settings, depending on mood or preference. Using the Driving Experience Control switch with ECO PRO mode on the center console, drivers can select between ECO PRO, COMFORT, SPORT or SPORT+ (most models). Each of these selections will activate different settings for the powertrain and suspension components.

In SPORT mode, throttle response is improved and the steering becomes more direct. If the automatic transmission is fitted, the gearshift points are also altered for sportier driving. Depending on the car’s specification, different settings can be selected for the powertrain and chassis components. In SPORT+ mode, the Dynamic Stability Control thresholds are raised and Dynamic Traction Control (DTC) is activated. The electronic limited-slip function for the rear differential can then provide better acceleration out of corners or sharp bends.