X4 is a crossover SUV model that was relreased in 2014. Series 3 and 4 could be named as relatives of X4. M Performance model was introduced in 2014. Most of the elements X4 gets from BMW X3. The same as it is with X3, XD4 model was announced in 2018 Geneva Motor Show by Alpina as a more powerful and customised version of X4, which with diesel engine will become highest acceleration having SUV in the world when it will be started producing.