Many experts were already prophesying the end of an era, when in 1988 Porsche then unveiled the 911 Carrera 4 (Type 964). After 15 years of production, the 911 was given an 85% upgrade, enabling Porsche to offer a modern, future-proof vehicle. The air-cooled, flat 3.6-litre engine now delivered 250 hp. The main external differences between the 964 and the previous model were the aerodynamic polyurethane bumpers and the electrically powered extendable rear spoiler. In engineering terms, however, there was hardly anything left to compare. The designers’ aim was that the car should impress not just through its sporty performance, but through its comfortable drive as well. Drivers had the pleasure of ABS, Tiptronic automatic transmission, power steering and airbags. This 911 also used a totally new kind of chassis with alloy wishbones and coil springs rather than the time-honoured torsion-bar suspension. In practically revolutionary fashion the new 911 was for the first time offered, as the Carrera 4, with all-wheel drive from the outset. The rear-wheel drive Carrera 2 was not launched until six months later. In addition to the coupé, convertible and Targa models, from 1990 customers were also able to order the 964 Turbo. Initially supplied with the tried and trusted flat 3.3-litre engine, the Turbo was given a 3.6-litre engine delivering 360 hp in 1992. The 911 Carrera RS, 911 Turbo S and 911 Carrera 2 Speedster rate as sought-after collector’s cars.