version. Unique to the Swedish market were a BMW 518i and a BMW 520i, fitted with the identical 2 litre engine, but the BMW 518i receiving poorer equipment. The BMW 520i was fitted with chromed wheel rings and a locking fuel cap. It was also fitted with head restraints in the rear, an armrest in the middle of the rear bench, steering wheel height adjustment, seat height adjustment for the drivers seat, a wooden shifter knob, and a rear heater. Motorsport versions Beginning in 1974, BMW M (then called 'BMW Motorsport') offered the Motorsport 530, Motorsport 530i and Motorsport 533i as special order upgrades for the 525, 528 and 528i models. The Motorsport 530 used the carburetted engine from the BMW 3.0S, the Motorsport 530i used the fuel-injected engine from the BMW 3.0Si and the Motorsport 533i used the injected 3.2-liter engine from the E24 633CSi. Other modifications were a shorter differential ratio of (3.45:1 for the 530 and 3.25:1 for the 530i), a 25% LSD, vented disc brakes, Bilstein shock absorbers, Scheel or Recaro sports seats, a sports steering wheel, alloy wheels on lower profile tyres, and optional front and rear spoilers. Later, the similar Motorsport 535i package was available for the 525i/528i model, consisting of the 3.5L engine from the E24 635CSi. M535i The first M-badged 5 Series was the M535i, which began production in 1980. The M535i is powered by the M90 straight-six engine which produces . The sole gearbox choice is a 5-speed manual and 1,650 M535i cars were produced (including 240 CKD for South Africa). Features include optional front and rear spoilers, optional M-striping, sports suspension, Recaro sport seats, the steering wheel from the BMW M1, a dogleg close-ratio transmission, a limited-slip differential and larger brakes. The M535i is considered to be the predecessor to the BMW M5 model, which has been produced since the E28 generation. Alpina B7 The Alpina B7 Turbo and B7 S Turbo were based on the E12. 530 MLE In South Africa, the 530 MLE was produced as a homologation special for racing, with 218 cars produced. The engine is a M30, producing . Significant weight reduction measures were undertaken, included body panels made from aluminium or thinner steel. Model year changes 1974 518 and 528 models introduced, producing and respectively.. Motorsport upgrades available as special order in 530, 530i or 533i guise. 1975 On the 520i model, Kugelfischer injection