hehehe well you can correct what I don't know then.
4DoorGTR: There isn't much information because there isn't much to it, apart from the RB26DETT and some mechanical upgrades over the standard Stagea to cope with the power such as body stiffen, Brembo brakes, suspension etc and in/ext cosmetics to give it more an up market feel...or in other words BCNR33 goodies dropped into a Stagea body. They also don't come cheap and were built at limited numbers but there are a few floating around for sale. They will do a mid-high 13s quarter or there abouts for 1720kg car...faster then most lighter competitors. Still they are a dam heavy car to throw around if you ever tried to drift one even in the wet, but there are a few 600ps straight line demon ones down at the Port (Justin will know where I'm talking about), else one to drool over is the 900ps+ Hyper Dolphin 260RS...Yikes!
I believe there is actually 2 versions or face lift versions of the 260RS, the one in your avatar and I think the other is an earlier one (or later) with the driving lights located in the grill. Which ever one it is, one doesn't have the discharge headlamps
I'm sure the Autech site would have a write up on it, you could search there.
edit: btw I think one or two have made the country a while back as well as a few RS Fours as well.