Just an FYI, it is possible to fit all 4 wheels and tires in the car

(19" Apex wheels)
It's a tight fit but definitely doable. My vote would still go to NT01s (305/325) because with the wider tires, improvement in the rear grip is very "VERY" noticeable
In terms of overall lap times, the difference between this and the OEM tires are about 1-1.5 seconds (very close to Trofeo Rs that I tested) in a 2 min lap course but it would be even higher with a good set of coilovers or maybe a bit more aggressive MRC calibration (DSC controller maybe).