Numbers first, because with the Porsche 911 GT3 they are the story: 3.6L (3,596cc) Porsche M96.79 N/A Flat-6, 360-380 PS. Porsche built from 1999, when airbags, anti-lock brakes and Japanese build quality became the world standard.
Where it came from
The Porsche 911 GT3 is a high-performance homologation model of the Porsche 911 sports car. It is a range of high-performance models, which began with the 1973 911 Carrera RS. The GT3 has had a successful racing career in the one-make national and regional Porsche Carrera Cup and GT3 Cup Challenge series, as well as the international Porsche Supercup supporting the FIA Formula One World Championship.
Under the skin
Power comes from 3.6L (3,596cc) Porsche M96.79 N/A Flat-6; 360-380 PS is the published figure. It weighs 3,043 lb. Work it out per tonne and you get about 118 horsepower — brisk everyday performance. It shifts through a 6-speed manual. The layout matters: the engine hangs behind the rear axle, a layout that gives ferocious traction out of a corner and a reputation to match on the way in. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
In context
Its family tree is legible: it took over from the Porsche 911 Carrera RS (993); assembly was at Zuffenhausen. Its contemporaries in the catalogue — the Bentley Hunaudières, the Bugatti EB218, the Mitsubishi Dignity — show what else the money bought that year. Nearby in the Porsche catalogue sit the Porsche P1 and the Porsche Type 12.
What it costs now
The money question first: $36,800–$134,200 is the typical asking range today, and running it — fuel and maintenance at its age — costs about $5,378–$8,298 a year. Insurance sits around $1,980–$4,960 a year. The figures are class-level estimates from the federal record, with the formula on the methodology page; the model-year pages carry complaints, recalls and repair costs year by year.
Porsche 911 
Porsche 911 GT3 R 
Porsche 911 GT3 R