Does anyone have an idea if the stock 17 or 18 would work better with a square setup? looking forward to future maintance as I'm sure this car will be trouble free for many years to come.

 

Define better. Either 17 or 18 inch wheels would work for a square setup. If you want a square setup with stock 18" wheels you'll have to decide if you want 8.5" wide (rear) wheels or 8" (front wheels) all the way around.

 

Thanks,

I'll go with the rear wheels on all four corners. Still researching everything I can about the IS350. It's a weird feeling that the car is at home in the garage while I'm still 1,800 miles away. Really looking forward to heading home.

 

17's are probably easier to find all in one size... the 18's you have to pay attention whats front and whats rear

 

I run a square setup but not with stock wheels if it helps. Here is what I run.

Wheels: 18X8.5 +35
Tires: 255/35/18