Hi, I want to upgrade my infotainment system (swap out the existing one), to a newer version. I'm particularly looking for compatibility with Sirius FM - I've got a Grand Touring, but although it's normally a feature of Grand Touring, my specific vehicle came without the ability to get Sirius FM. The infotainment system has been getting more and more glitchy, and I'd love to upgrade to whatever newer system components will fit. I believe my display is 7", and I think the 8" will fit... but it's really the infotainment programming/head unit that I want to replace. Has anyone done that? And apparently I'd also need an antennae for Sirius FM - does anyone know where that gets located? Thanks!