Have 20's all the way around. That was how it was when I got it.
No issues really. My fronts just scrape. Turn the tires or just not pop it up all the way before lifting the clam.
Have tracked the car and seems to be good! I did find that the 3.73 rear did help with gearing/kick in the pants feel.
My only complaint: Your brakes will look very small though!
Also do consider that lowering the car will create rubbing. I will post a pic here of the somewhat 4x4 look the car gets. As it is with 20's on the rear, on really good bumps, the tires have been known to rub.
Anything else you want or need to know?
Here are a few shots of what they look like: