2003 G35 Coupe

Looking for some help. I want to add some 19 inch rims to replace 18 now. My question is if I don't lower how bad will the wheel gap be. looking at AXIS Shine 19x8.5 35mm / 19x9.5 400mm with toyo T1R 245/35 275/35 I'm looking for any sugestions I can get.