BMW introduced the M535i in 1979. The first BMW Motorsport M-badged 5 Series car, the M535i featured various mechanical upgrades, such as an improved suspension and larger brakes. As well as the improvements to the drivetrain, the M535i was powered by BMW's M90 3.5L straight six engine, producing 215hp. Visually, the car was fitted with front and rear spoilers as well as a new steering wheel. Considered to be the precursor the E28 BMW M5, the M535i was in production until 1981, with 1,650 examples built.