1998
For 1998 optional rear side airbags became available, and both models also gained BMW's exclusive new Head Protection System, which consists of two tubular bags that inflate upon a side impact and pop out just above each front door. A new Sport Package for the 528i and 540i, as well as an automatic transmission 540i were added options. The Sport Package included black body trim (standard models had chrome around the top of the windows), a sport-tuned suspension, and 17-inch (430 mm) wheels and tires. In September 1998, the 540i's M62B44 was updated to the M62TUB44, adding 15 ft·lbf (20 N·m) of torque. DSC first became available on 540i with automatic transmission as of 9/97