Touring/Sport came with 245-275, Nismo's came with 245-285.
Do you know how wide your rims are? If 275s fit, perhaps 285 will fit too, it's 5mm on each side of the wheel. You can try to predict fitment based on how "stretched" the tyre looks on the wheel at the moment.
Regarding grip - yeah, you'll get a bit more grip, but nothing TOO crazy.
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