For the 964, Porsche developed a new 3.6-litre six-cylinder boxer engine. For the naturally aspirated versions with and without all-wheel drive, the engine delivered 250 PS and a top speed of up to 260 km/h. Shifting was done using a five-speed manual gearbox or an optional Tiptronic automatic transmission – a first appearance for this style of gearbox in a Porsche. From 1990, Porsche once again offered a 911 Turbo, with a 3.3-litre six-cylinder boxer engine and 320 PS. Porsche Exclusive, however, would modify the Turbo model on request, delivering a power boost to 355 PS. In the Turbo S Coupé, the engine delivered up to 381 PS. From model year 1993, the Turbo featured a rear-mounted boxer engine with a 3.6-litre displacement and 360 PS. With the 964 generation 911 Carrera RS 3.8, Porsche returned to the famous RS moniker in 1989 to continue its success on the track. The extremely sporty 911 Carrera RS 3.8 of 1993 featured a 3.8-litre naturally aspirated engine with 300 PS.
