i have 19x8 konigs with 225/35 Nitto 555s. i cut the rear fenders a few millimeters when i had 18s because im down about 2.5 inches. you cant cut more than a centimeter without splitting the weld on the fender.
just make sure you get the offset right because if the wheel is outside the fender lip you wont be able to correct the camber without crushing the rim on the fender. and get 35 series tires obviously.

1995 Eclipse GS - HRC Stage 2 - Retired.
2004 350z Enthusiast / 2008 Nissan Versa SL