:shrug Has anyone tried these mufflers on their '05-'06 GT? If so, how do you like them? Have they met their claims (horsepower/mileage increases)? I was reading about it on their website (www.aero-turbine.com) and they look and sound pretty good. I'm trying to pick out some axle-backs for my supercharged '05 GT and I'm just not sure. Please post if you know anything about them. Thanks.