I'm running the Pilot Super Sports with 245/40/19 on the front and 285/35/19 on the rear. I used Tire Rack to compare the various dimensions before pulling the trigger. Their site allowed me to determine the change from stock with the various sizes and made it easier for me to make up my mind.
2014 Black Premium GT Manual with Tech Package
3.31 gears, FRPP TracKey tuned, FRPP K springs, FRPP Adjustable Shocks/Struts, FRPP front/rear sway bars, FRPP Panhard, Steeda UCA / LCAs, GT500 Quad tip AB, MGW shifter, Niche Targa Blk 19" Staggered wheels with Michelin Pilot Super Sports