Alpina created five variants based on the E28 BMW 5 Series, starting in 1981. The three main variants were the B7 Turbo, the B9 3.5, and the B10 3.5. Each of these cars featured a unique engine, with the B7 and B9 recieving mid-life upgrades, these updated cars are known as the B7 Turbo/1, and the B9 3.5/1. Production of the Alpina E28 generation ended in 1987, with the next generation Alpina E34 taking its place.