997 is the internal designation for the Porsche 911 model manufactured and sold by German manufacturer Porsche between 2004 (as Model Year 2005) and 2012. Production of the Carrera and Carrera S coupés began in early 2004, all-wheel drive Carrera 4 and Carrera 4S versions began shipping in November 2005, Turbo and GT3 derivatives went on sale in late 2006 and the 911 GT2 in 2007. In addition to the coupé and cabriolet versions, Targa versions of the Carrera 4 and Carrera 4S were also available, which carry on with the "glass canopy" roof design used on all Targa 911s since the Type 993 Generation 911.
In 2012 it was replaced by the new 991.
The 997 was an evolution of the preceding 996, with the most significant changes being interior and exterior styling. 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, (Wikipedia)