The vehicle would supposedly use a stretched version of the coupe's FM platform along with all the mechanical hardware including the 480HP twin turbo 3.8-liter V6 engine, the sophisticated all wheel-drive and the dual clutch semi-auto transmission.
The computer rendering you see above gives us a pretty good idea of what the GT-R sports sedan would look like if Nissan were to actually produce such a model. This is not the first time we've heard rumors about Nissan considering the possibility of developing an BMW M5 rival off the new GT-R, and it certainly won't be the last.
But unless we see some sort of hard evidence in the form of let's say scoop pictures of a prototype test model, a four-door GT-R will remain nothing more than a rumor.
Via: Best Car , Thanks for the pic Tim!