I guess I am obligated to comment on this thread too since I did nearly the exact same thing as Blazin haha. So I started with 19x9 Boss 302S Rims with 255/40/19 Bridgestone potenza S-04s for DDing and tracking and then purchased a set of 18x10" F14s with 275/40/18 RE-11s for track days lol. The difference between the 2 setups is incredible. First of all, the difference in weight between the 2 setups is night and day. It's incredible. The stang feels so much lighter and like it gained +50HP or something. It almost bums me out when I switch back over to my boss rims for DDing hah. I purchased mine from AM as well, however the 10s fit fine in the front. The only thing that wont fit are the wheel caps that come with the rims, so I go without them all around.
I've only done 2 track days so far this year and the first I forgot how to drive my car (lol). Once I remembered everything went MUCH smoother. I was able to pull 1.11Gs at Gingerman Raceway in Michigan. I wasn't too far behind my buddy who is a good driver with a souped up Lotus Exige S with slicks on it! Next up is ordering adequate track pads for the big girl (Carbo XP12s) and titanium shims to help reduce heat to my calipers.
2014 Race Red GT/CS Manual/3.55 Gears: Steeda shifter bracket, Boss 302 Quad Exhaust, Boss 302S 19x9 Wheels, 255/40/19 Bridgestone Potenza S04 Pole Position Tires, Vorshlag Brake Duct kit, 14" Brembro brake upgrade, JLT Passenger Oil Separater, Boss 302 Laguna Seca Shocks, Track Pack front springs, Boss 302 Rear springs, Steeda LCAs, Boss 302 Panhard Bar, Boss 302 Transmission Cooler Scoop, Boss 302 Oil Cooler, GT500 Finned Differential Cover, GT500 Axleback Mufflers, FRPP Pro Cal Tune