First one is an NA RB26, I think autech did that one too. Nice extractors. All they did really was remove the turbos, still had 8.5 to 1 comp so nothing special there..
Second car, the 4 door GTR, only a few getting around, also by autech. HPI magazine did a cover on them years back.
Autech also did the convertible S chassis NA and auto.
And the S15 SR20DE 6 speed man.
Autech have done a few nissan specials!