Porsche 997 is the internal designation for the Porsche 911 sports car manufactured and sold by the German automobile manufacturer Porsche between 2004 (as Model Year 2005) and 2013. The 997 was an evolution of the preceding 996, with the most significant changes being interior and exterior styling, the most notable being the replacement of the «fried egg» headlamps used on the 996 with the classic «bug eye» units. Larger 18-inch wheels were fitted as standard, and other engineering changes include slightly increased power; however, the car is technically very similar to its predecessor. A new S version was offered, with additional power from a slightly larger engine, sports suspension, and sports exhaust.

During 2009, Porsche updated the 997 line-up including styling changes, a revised engine with direct injection and the introduction of the company’s new «PDK» dual clutch transmission. As a result, the updated 997 models were faster, lighter and more fuel efficient than the outgoing versions, with improved handling. In the case of the 997 Turbo, a comprehensively re-tuned all wheel drive system with an optional «torque vectoring» system was also a part of the upgrades package; in an October 2009 preliminary review, Car and Driver magazine estimated that when equipped with the PDK transmission, the updated Turbo should be capable of accelerating from 0–97 km/h (0–60 mph) in three seconds.

In 2011, Porsche launched a new, mid-level 911 coming in above the Carrera and below the GT3. Ranging from $103,100 to US$112,900, the Carrera GTS was available as both a coupé and cabriolet, the car gets a wider body and track, the only Carrera variant with a wide track that is also rear wheel drive. The car also has an upgraded 3.8-litre engine generating a maximum power output of 408 metric horsepower (300 kW; 402 bhp). The Carrera 4 GTS equipped with all-wheel-drive was unveiled in May 2011. In addition to the AWD system, the Carrera 4 GTS can be identified by a distinct reflective stripe between the tail lights. All GTS vehicles came standard with center lock wheels, Alcantara interior and other optional extras such as Porsche Sports Exhaust and PASM.