The BMW E90 series is the fifth generation of the BMW 3 Series range of compact executive cars. The car is also available as a touring (designated as E91), coupé (E92) and coupé cabriolet (E93). A high performance BMW M3 version of the E90, E92, and E93 is also available. It is the successor to the E46 model, and was launched in 2005.
It is completely re-engineered from the E46, including changes to engines, transmission, the passenger compartment, suspension technology, as well as the addition of a host of high-tech features and options. The coupé/cabriolet body is now its own design and no longer derived from the sedan/wagon (unlike its predecessors), and is slightly longer and narrower with 2+2 seating compared to E90/91 which retains the rear three-passenger bench.
The E90 came in two trims, the 325i/xi and 330i/xi models.
Source: Wikipedia, 2012