The Type 997, or simply 997 (nine-nine-seven) is the internal code name for Porsche's most current version of the "911" Carrera model. Production began in July 2004 and two variants, the Carrera and Carrera S coupes, were avaliable immediately. The base Carrera has essentially the same 3.6 L flat-6 engine that it's predecessor, the Type 996 Carrera used, producing 325 bhp (239 kW). The Carrera S uses a new 3.8 L flat-6 engine producing 355 bhp (261 kW). While the exterior styling is changed, it is again more evolution than revolution, typical of Porsche and the Carrera. The most notable difference between 997 and outgoing 996 is the return to circular headlights, like those of pre-996 Carreras, with separate indicator units. The interior has been almost entirely re-invented and all the the controls are new. According to road tests, the Carrera S model is capable of 0-100 km/h (0-62 mph) in 4.1 seconds, and a top speed of 293 km/h (180 mph), while the standard model is slightly slower, with the capability to run 0-100 km/h in 4.4 seconds and carry top speed of about 285 km/h (175 mph).