Hello all...my stock set up on my 2011 4Matic wagon is 245/45/HR17 all around. Considering putting staggered rims from a 2011 coupe with 235/45/HR17 on front and 255/40/HR17 on the rear. Any problems with running a staggered set up? New offset will be Front (45mm) and Rear (49mm) as opposed to stock (48mm.) Thanks for the assistance.

Try using willtheyfit.com
As long as you've got ~5mm of play, you should be alright. Front will definitely fit, I'm assuming that your stock wheel width is 9.6 inches and you arent running stretched tires.
Pretty sure the car will feel more balanced if you are running same tire size all around. Could be wrong tho.