In an effort to make 3 Series ownership more affordable, BMW adds four-cylinder versions of the sedan, coupe and convertible to the lineup -- these models take the name "318." Output is rated at 134 horsepower, and a five-speed manual is the only transmission choice. Standard equipment on these cars includes antilock brakes, a driver-side front airbag, air conditioning, a cassette player and power windows, mirrors and locks. A limited-slip differential is optional, as is a sunroof on the coupe and sedan. Meanwhile, the 325i convertible now comes with a power-operated top and cross-spoke alloy wheels; additionally, it gets integrated body-color bumpers and new headlights. Note that this is your last year to get your hands on a coupe or sedan of the E30 generation, as both body styles will get a full redesign for 1992.