Talk to Vorshlag, they sell a set of custom Forgestar F14s that are 18x11. You do need to replace (whiteline's rear sway is about the only option for this) or remove the rear sway bar if you want anything wider than a 10", and with an 11", you would need to go to a watts link (panhard bar would be risky). It is amazing what will fit under the stock sheet metal of these cars.
2014 Mustang V6-Built to run TTB, CAM-C, and ESP
Proving to my fellow racers that the disdain that some GT drivers have for V6 drivers is unfounded, one results archive at a time since 2013.