1999-2004 (996)
The 996 was the most radical departure the 911 had ever taken, introduced for the 1999 model year as the first entirely new platform since the original 911 launched in 1963. Water-cooled engines replaced the air-cooled units that had defined every 911 before it, a change that generated fierce debate among purists at the time but proved necessary to meet tightening emissions and noise regulations. The styling was equally new, with a smoother, more aerodynamic body and headlights that drew immediate criticism for their resemblance to the contemporary Boxster.
Early cars (1999 to 2001) used a 3.4-liter flat-six making 296 hp, before a broader facelift for 2002 brought a 3.6-liter engine at 320 hp along with revised styling and the introduction of the Carrera 4S, which borrowed the Turbo's wide body and brakes without the turbocharged engine underneath. The Turbo arrived for 2001 using a version of the water-cooled Mezger engine developed from Porsche's GT1 race program, producing 415 hp through standard all-wheel drive, with an optional X50 Powerkit pushing that to 444 hp. The GT3 debuted in Europe for 1999 at 360 hp but wasn't sold in the US until the facelifted 996.2 version arrived for 2004 at 381 hp, making it the first GT3 American buyers could actually purchase new. The GT2 pushed further still, at 462 hp initially and later 476 hp, delivering that power exclusively to the rear wheels with no traction control, one of the most demanding 911s Porsche has built. The generation closed out with the Turbo S at 450 hp and the 40th Anniversary Edition, a Carrera-based special with the X51 Power Kit's 345 hp, both marking the platform's send-off before the 997 arrived for 2005.
- Model years: 1999 to 2004 for standard Carrera models (US market); Turbo, GT2, and GT3 continued through 2005
- Trims: Carrera, Carrera 4, Carrera 4S, Targa, Turbo, Turbo S, GT2, GT3 (996.2 only, US market)
- Power range: 296 hp (early Carrera) to 476 hp (GT2)
- Transmission: 6-speed manual standard, 5-speed Tiptronic automatic optional (non-GT trims)
- Notable firsts: first water-cooled 911 engine; first 911 GT3 (though not sold new in the US until the 2004 996.2); first 911 with a factory navigation option
- Available as: Coupe, Cabriolet, and Targa depending on trim, with GT2 and GT3 offered as Coupe only