E9x

E9x is the BMW internal designation for the fifth generation of the BMW 3 Series, produced from 2005 to 2013. The family comprises four body styles: the sedan (E90), the wagon (E91), the coupe (E92), and the convertible (E93). It followed the E46 generation and was succeeded by the F30/F31 models in the early 2010s. The E9x introduced a more rigid chassis, revised suspension tuning, and improvements in efficiency and interior quality.

The lineup offered a wide range of petrol and diesel engines, including turbocharged inline-6 units. The high-performance 335i model used a turbocharged inline-6 engine (initially the N54 twin-turbo, later the N55 single-turbo). Diesel variants covered popular displacements for European markets, emphasizing economy alongside performance. A notable addition across the range was the modernization of drivetrain options, with manual and automatic transmissions available in most markets.

A high-performance derivative, the M3 (E92), was introduced in 2007 and featured a naturally aspirated V8 engine, advanced chassis tuning, and distinctive quad exhausts. The M3 is widely regarded for its balanced handling and track capability within the E9x lineup.

The E9x received a mid-cycle refresh in the late 2000s (often referred to as a life-cycle impulse), updating styling elements, interiors, and some mechanical components. The generation is remembered for its versatile body styles, improved interior comfort, and a broad engine lineup that balanced everyday usability with performance variants. It remains a popular platform for enthusiasts and occasional motorsport use, with a strong aftermarket and community around tuning and preservation.