The BMW 4 Series 440i M Sport Convertible (326 ps) Auto is a premium, open-top grand tourer powered by BMW's highly acclaimed 3.0-litre straight-six B58 turbocharged petrol engine. This generation (built between 2016 and 2020) stands out because it utilizes a three-piece electric folding hardtop roof, striking a perfect balance between a quiet, insulated coupe experience and open-air performance.