<P> The Porsche 911 ( pronounced Nine Eleven or German : Neunelfer ) is a two - door , 2 + 2 high performance classic German sports cars made since 1963 by Porsche AG of Stuttgart , Germany . It has a rear - mounted six cylinder boxer engine and all round independent suspension . It has undergone continuous development , though the basic concept has remained little changed . The engines were air - cooled until the introduction of the Type 996 in 1998 , with Porsche 's `` 993 '' series , produced in model years 1994 -- 1998 , being the last of the air - cooled Porsches . </P>
<P> The Porsche 911 ( pronounced Nine Eleven or German : Neunelfer ) is a two - door , 2 + 2 high performance classic German sports cars made since 1963 by Porsche AG of Stuttgart , Germany . It has a rear - mounted six cylinder boxer engine and all round independent suspension . It has undergone continuous development , though the basic concept has remained little changed . The engines were air - cooled until the introduction of the Type 996 in 1998 , with Porsche 's `` 993 '' series , produced in model years 1994 -- 1998 , being the last of the air - cooled Porsches . </P>
when did porsche go to water cooled engines
when did porsche go to water cooled engines
1998
1998