But as with any increased diameter, weight is a concern. If you are not planning on shelling out a few grand for a lightweight design, you are going to be adding an assload of unsprung weight to an already heavy car. This is bad. Plus 19s are the limit lookswise to me anyway, there are many who say that even 19s cross the line.
The real purpose of large diameter wheels are to be able to fit BBKs.