First, my apologies if this is covered in another thread (I'm sure it's highly likely) but I couldn't find it. If someone wants to point me in the right direction and delete this...but I'm driving a 2015 S 2 door hardtop with the "base" 16" wheels. What I really want is some better tires but would like a nicer looking wheel as well. My question is...why would I NOT stay with the 16" size? What is the advantage of going up to a 17" or 18" wheel? Is it just appearance?