Stock rear is 26" and stock front is 25.1". Any size increase more than 3% (about 3/4 of an inch) may cause problems with the stability control even if you found a solution (and went through all the headache) to increase suspension travel and wheel well spacing to fit it. Speedometer would be of significantly overstated at highway speeds, gearing would effectively be taller, and any appreciable increase in unsprung weight would adversely affect performance. It may look nice when parked but the tires will rub on any type of uneven pavement, and cause more headaches than its worth. Plus you'd have to keep a pretty consistent stagger size differential between the rears and the front, and trying to increase the fronts that much would be an even bigger headache and at best would prematurely wear the cars front end.