1990 Porsche 928 S4 $49,500 Year: 1990 Make: Porsche Model: 928 S4 Mileage: 43k Engine: 8-Cylinder, 5.0 Liter Transmission: Automatic Drivetrain: RWD Key Features: meticulously maintained, new tires, OEM 17” Cup wheels,  Concours d’Elegance winner In 1990, the 928 S4 was no longer available with a manual gearbox (manual only available in 928 GT at the time). […]