Should go with stock size. I thought of going 305's on the back of my nismo until I drove a friends with the setup. Stock feels like it is on rails, oversize feels like marshmallows to me like the sidewalks are flexing exorbitantly.
As I said I wanted to do it and I know it can be done on the 19's of a Nismo, but if you are looking for a limited informed opinion, I'd say don't do it. It's only done for the look anyway, why not just get spacers?
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