(2011) The Concept A-Class is a 3-door concept car that previewed the design of the third generation A-Class and was unveiled at the 2011 New York Auto Show. It featured the M270 four-cylinder petrol engine rated at , radar-based collision warning system with adaptive brake assist, and exterior design language from Mercedes-Benz's F800 concept. Models Driving school package (2012–2018) Designed for the German RoadSense programme, the basic driving school package includes adaptation of the cockpit to accommodate the twin sets of pedals, a control switch in the centre console for driver's footwell illumination and warning signal for the twin sets of pedals, twin rearview mirrors, the Light and Sight package and the Seat Comfort package. The package is also part of the special A-Class "toBE" model, with deliveries from January 2013. A 45 AMG (2013–2018) The A 45 AMG is a performance version of the A-Class, fitted with a 2-litre four-cylinder turbo engine rated at at 6000 rpm and at 2250-5000 rpm, AMG Speedshift DCT 7-speed sports transmission with Momentary M mode, 4MATIC all-wheel drive, 3-stage ESP with ESP Curve Dynamic Assist and "ESP Sport Handling" mode, AMG sports suspension with independently developed front and rear axles, high-performance braking system with 350 x 32 millimetres front brake discs and 330 x 22 millimetres rear brake discs, and is identifiable by the "twin blade" radiator grille, AMG light-alloy wheels in twin-spoke design and two square chrome-plated tailpipes. With , the A 45 and its derivation vehicles, CLA 45 and GLA 45, have the highest specific output per litre of 187.5 horsepower per litre for a four-cylinder motor in the passenger car sector as of September 2017. The Bugatti Chiron has the same specific output as A 45. The vehicle was originally announced to be unveiled in the first quarter of 2013, but was later unveiled at the Geneva Motor Show. The sales release date was set for 8 April 2013, with Germany marketing beginning in June 2013. Engines The A-Class is powered by a range of 4-cylinder petrol and diesel engines, with the 1.5 diesel engines being versions of a Renault unit. Transmissions Equipment Drive Kit Plus for iPhone, Mercedes-Benz phone module with Bluetooth, roof box 400 with Alustyle Quickfix carrier bars, Mercedes Sport product range (a spoiler lip for the front apron, a gleaming black radiator grille, gleaming black exterior mirror casing and waistline trim strip, a roof spoiler and