Autech is owned by Nissan. They do all sorts of conversions to Nissan vehicles, ranging from camper conversions through to tweaked Skylines.
They did my R31 GTS Autech, only 200 made. Then came the R32 Autech which was a 4 door fitted with an RB26DE (yes that is correct, NO turbo's ;) ).
Then was the 34 shape Stagea 260RS Autech with GTR running gear.
Then was the R33 Autech which was a 4 door with modded shell and GTR running gear. It was done as a 40th anniversary model.
Last R33 Autech I saw in auction had a START price of about £16,000