I would not do it. We have the 550 GT 20 inch rims and the front tires are a replacement waiting to happen (have done twice in less than 8K miles). Tiny Pot Hole, tires bubble out on the side and have to be replaced. Love the car but cannot stand the tires.
2009 - Dodge Ram w/Hemi - Da Beast
2012 Honda Civic- commuter
2010 - 550i GT