E91 is a designation that can refer to various topics, but it is commonly associated with a specific model of the BMW 3 Series. This model was produced from 2006 to 2013 and is known for its sporty design and performance. The E91 variant specifically refers to the station wagon version, offering more cargo space while maintaining the driving dynamics of the sedan. The E91 features a range of engine options, including both gasoline and diesel variants, catering to different preferences and markets. It is equipped with advanced technology for its time, including iDrive infotainment systems and safety features, making it a popular choice among car enthusiasts and families alike.