As said you wil have to have 195 45 16 tyres on. You will have to roll the arches to if you want passengers in the back. I bought an arch roller and did them myself (I have one for sale)
As 1-PD says handling isn't the best, but saying that once you get used to them its fine. I can throw mine into corners now confidently and don't notice it anymore. Well worth the effort as I think cosies on a mk6 look awesome.
Was at ford fair yesterday and had nothing but good comments on how the wheels suited the car