This 1989 Porsche 911 Turbo is a factory M505 slant nose cabriolet that was sold new at Berkey Imported Cars in Pleasanton, California, remaining registered in that state until it was purchased by its current owner in 2018. Powered by a turbocharged 3.3-liter flat-six paired with a G50 five-speed manual transaxle, the car is finished in Guards Red…