BMW X5 2001 3.0i wheel and tire question?

Bato B

Rookie
I wanna upgrade my manufacture wheels to 20''(front-9.5,rear-10.5) wheels will it be OK?Coz I've heard that if it's 4wheel drive then something terrible could happen to my car.I also want to put tires:275/40/20 to front and 315/35/20 to rear.Will it work?Thanks in advance!
p.s.Please do not suggest me to call to BMW dealership,coz I allready did and those douches don't know anything!!!
 
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