The Porsche 965 was an engineering mule, used to try and solve the tough problem of how to replace the 930's turbocharged, air-cooled engine to power a new sub-959, range-topping 911. Costs ballooned, the project floundered, and ultimately in its last throes, its engineers got desperate. The flat-six with water-cooled heads was too complex, and too expensive, to work. A water-cooled Audi V8 was tested out back, a last-ditch effort to find a cost-effective, power-dense solution.