I am actively shopping tires right now. Every piece of steering and suspension has been replaced on the car except for the steering rack itself. I have test fit the wheels on the car without tires on them and clearances look good... not that I was expecting any issues since guys have been running Mustang wheels on grand prixs forever. I am actually looking for a little more from the car with 18's. The Addco sway bar, the BMR trailing arms, the Dorman front sway bar and the ZZP strut tower braces really woke the car up. I anticipate having new tires within a couple of weeks so I can give some feedback then. Definitely going with 245/45-18's. Been eyeballing the Cooper RS3A's.... looks like a solid tire that does everything well.