Well actually, yes they were made by Autech.
The Autech GT-R 4-door version was released to celebrate the Skyline's 40th birthday. The car is a 4-door version of the R33 GT-R V-Spec and gets all its ingredients, like the RB26DETT engine, ATTESA-ETS and Super-HICAS. The Autech also features all the sporty interior updates of the GT-R, like bucket seats etc. Two versions of the 4-door GT-R were available from Nissan's subsidiaries: the first was produced by Autech, and the second was a joint Autech/Nismo project.