How can I change the tire size on my Audi A4?

I want to install bigger tires on my Audi A4, what size should I go for and what changes do I need to make to my car to accommodate the new tires?

Bigger tires can improve the handling and grip of your car, but it's important to choose the right size to avoid any negative effects. Consult with a professional mechanic or do research on reputable car forums to determine the appropriate size for your particular Audi A4 model.