I upgraded voluntarily from a 06 GT and the only thing I miss is the fact it was passed down by my late grandfather. Other then that I don't miss that thing at all. Congrats and welcome
Welcome! Congrats on the new purchase, we all know you plan on modding it! So what is first on the list. You can get some ideas from here (http://www.latemodelrestoration.com/2015-Mustang)! If you need anything like the forum discount code feel free to shoot me a PM!