does anyone have 20's on their G35 coupe?

Im trying to get some rims on my G35 coupe but i noticed if i want to get 20's i have to shave my fender.... but i dont really want to if it affects the car so now im thinkin i should just to with 19's
If anyone has 20's on their G35 can u give me some pointers??? if i should shave the fender and get 20's or just get some 19's