Originally Posted by IS3andME
Quite possibly it could be that getting the RB26DETT to pass emissions was geting harder, just like it was for Toyota's 2jzgte and their Lexus Division's 2jzge in the IS300---each were phased out due to harder to pass emissions tests.
It was probably easier to simply modify the VQ engine rathern then put further R&D into an engine for *one* low-production model (sound familiar?).
If the N55-->S55 is equivalent to VQ35-->VR38, I'll be ok with this.