Was given some Rims as a parting gift a while ago, just trying to figure out the best size tyre...

Its a MY00 GC8, rolling on stock size tyres, and the car is lowered on Kings superlows (i think)

New rims are 17x7.5 and 45 offset. looking at the wheel fitment thread, 215/40 seems to be the size... or could i get away with 225/40? has anyone ran that size on the 45 offset before?