The 930 Turbo was introduced in 1975; it was the Porsche's top-of-the-range 911 model for its entire production duration and at the time of its introduction the fastest production car available in Germany.
The 930 proved very fast but also very demanding to drive fast, prone by its short wheelbase, rear engine layout to oversteer and turbo-lag.
Porsche made its first and most significant changes to the 930 for 1978, enlarging the engine to 3.3 litres and adding an air-to-air intercooler. By cooling the pressurized air charge, the intercooler helped increase power output to 300 hp; the rear 'whale tail' spoiler was re-profiled and raised slightly to make room for the intercooler. Porsche also upgraded the brakes to units similar to those used on the 917 racecar. While the increase in displacement and addition of an intercooler increased power output and torque, these changes also increased the weight of the vehicle, especially to the engine, which contributed to a substantial change in the handling and character of the car when compared to the earlier 3.0 litre models.