It seems blasphemous to me to give a new chassis code (Z35) to Z that is cobbled together using existing Nissan/Infiniti parts
And 300Z is a poor choice IMO cuz it's way too close to the 300ZX moniker.
400Z seems like a logical next step because it works with a 4.0 engine displacement or a 400 HP mark. The internet just ran with it.
They should call it the 345Z as a nod to the chassis code which should be Z34.5
