The third generation Mini was unveiled by BMW in November 2013, with sales starting in the first half of 2014. The new car is 98 mm longer, 44 mm wider, and 7 mm taller than the outgoing model, with a 28 mm longer wheelbase and increases in track width of +42 mm (front) and +34 mm (rear). The increase in size results in a more extensive interior and a boot volume increase to 211 litres. MINI has also released an all-new model called the MINI 5-door (known as the 4-door in the US, model code F55). It is marketed as a 5-door version of the new third-generation Hatch. The base MINI 5-door is 6 in (152 mm) longer and 190 lb (86.2 kg) heavier than the 3-door MINI Hatch models, with similar performance characteristics and greater interior and boot space. In 2018, the Life Cycle Impulse (LCI), the 6-speed Steptronic torque-converter were replaced by a 7-speed dual-clutch transmission in all models but the Cooper SD and JCW, with the latter now fitted with an 8-speed Steptronic auto. These changes allow for improved efficiency and better emissions test results in the WLTP cycle, as well as marginally improved performance.