The 1979 911 Turbo is the second iteration following the 1975-1977 "930" which featured a 3.0 liter motor without an intercooler. In 1978 Porsche upgraded the motor to 3.3 liters, ventilated brakes, suspension upgrades, larger wheels and a larger wing to accommodate the new intercooler.
My Turbo is a USA example with less than 35,000 original miles and is completely stock. It features sport seats, limited slip, sunroof, electric mirror and a black headliner. I searched for 4 years before finding the right "930" and I love it!