I'm pretty sure it's still a 1zz with a big exhaust. Indeed the A pillar is a give away, also when the windows are up you can definatly see the more rounded shape of the window versus the sharp line of the original.Except the mr2 replica wouldn't cost so much in maintenance and be more reliable... but then you may as well just buy a NSX if you want a reliable supercar.
As a concept, this thing looks great, as always the A pillar is the dead give away, i want to know how they achieved that exhaust note. Its either fake ( ie. speakers ) or maybe an engine swap?