The GT-R was always just one version of the Skyline. This name is, and has for many years been, a Nissan mainstay. Skylines have always come in a variety of trim styles and in boht coupe and sedan versions. The Infiniti G35 is a Skyline and essentially the same car can be bought in Japan as a Skyline. The G35 coupe is the same as the Skyline GT350 which replaced the GT-S (the version of the previous skyline that was just below the GT-R). The previous GT-S was a 2.5 liter six with a single turbo.