Hi there, i am new to all this thread stuff, i am looking for abit of advise!!

I have a 2007 S3 and i also have a set of 19" BMW X5 alloys that i would like to put on the car, i have sorted hub addapters.
I would like to no if anybody has done this conversion and if theres anything that i should be aware of for example the rolling radius of the wheels being that the S3 is a 4x4 and if theres any extra spacing thats needed, the X5 wheels are very wide and i am aware that they will stick out the side of the car i dont care about it being illegal it just has to look good!!

Any info would be highly apriciated!! many thanks :D