Nismo parts aren't factory option though, They're aftermarket. Only time they'd be factory options would be for one of the Nismo released models, 400R, ZTune etc.
Not modifying an N1 kinda defeats the entire purpose it was built for in the first place. They're for race car homologation, it's supposed to be a race car. It's supposed to be a base to add on and change as your team sees fit to make it faster