While driving I heard a rattle noise sometimes with I shift gears and sometimes when going over a bump. I took the car to the ford here in Germany and they couldn't figure it out. There is also a guy here with the same year 2008 SGT but hardtop and he has the same issue. Right now Ford has called someone from Frankfurt head office to come down and look at the car because no one can figure this out. I do remember hearing something about the car having a two part driveshaft and guys are replacing it with a solid one piece driveshaft. Could stock driveshaft be causing the rattling I'm hearing?
I would just about bet the house it's the drivers side muffler bracket, mine drove me crazy for months untill I found it, It's too long as was rubbing on the frame, good luck