First seen at the Geneva (Switzerland) auto show way back in 1977, Porsche's "flagship" model gained dual airbags, a limited-slip rear differential, and a tire-pressure monitor for 1990. This year's change made Porsche the first manufacturer to offer standard airbags for both the driver and the front passenger. Porsche considered the 928 to be its Premier Grand Touring automobile, promoting its exclusive Weissach rear suspension as an enhancement to stability. The luxury/sports 2+2 hatchback coupe was powered by a front-mounted V8 engine, unlike the rear-engined 911 series. With a 5-speed manual transmission, the 5.0-liter, 32-valve dual-cam aluminum-alloy V8 developed 326 horsepower; but with 4-speed automatic, output dipped by 10, to 316 horsepower. Model designations were 928 GT with manual shift, and 928 S4 with automatic. Antilock braking had been standard since 1986. The new limited-slip differential automatically transferred more torque to the wheel with the most traction, based on wheel speed, slippage, and lateral acceleration. The tire-pressure monitor alerted the driver if any tire dropped below a preset level. Standard equipment included automatic climate control, leather power seats with driver's memory, power windows, power door locks, an alarm system, cruise control, sunroof, heated power mirrors, heated windshield-washer nozzles, fold-out door armrests, cassette stereo, and foglights. Forged alloy wheels held 16-inch tires.