That's BMW's. The biggest difference between BMW and other cars is the shape of the engine. Most of BMW's series are inline cylinders, that is, four or six cylinders are arranged in a straight line. This technology is beyond the reach of ordinary cars. The front-to-rear weight ratio of the car is 50: 50, which greatly improves the stability of the car and helps to improve the speed of the car. The cost of this technology is relatively high.