I have the 275/40R19 mounted on my brembo wheels on a '11 5.0
I can assure you that they are much better tires than the stock pirellis trash tires, that did no last. These Michelin Super Sport tires are great, but I don't have any idea how they will work as Winter tires, since I'm in South TX and don't need to worry about that.
2011 Mustang GT Premium, Brembo, 3.73 & Std. transmission, Steeda Sport springs & KONI STRT. GT500 strut mounts, 275/40R19 Michelin Pilot Super Sport, HAWK HPS + ATE DOT 4, Rear CS style pedestal spoiler. Eleanor style side scoops, "C" style side decals, Black AM BOSS style roof vinyl, black hood custom vinyl & Black pony.