I've been lurking these forums since the 05 'stang was announced. I just traded my 2004 350Z for an all black V6 vert last week. So far I'm not sure this was such a great idea! Since the first time I've had the car over 60mph it shakes and rattles like crazy. I had the dealer "road force" balance the tires last weekend and the situation still hasn't improved. The car came with aftermarket rims/tires installed by the dealer, although I'm thinking that the real issue is something else? The wheels are Falken 245/40ZR19s in the front and 285/40/ZR19s in the back. They hold on great and look awesome but once the car is over 60-70mph the whole thing shakes/vibrates. I'm worried that this situation will only get worse - the car has 1400 miles as of this post. Is anyone else with a vert experiencing similar problems? Would it make sense to try switching to less aggressive rims/tires? I'm not knocking the car as a whole with this post. Even this morning despite the rough ride I still thought to myself how much I love the look of this car. The performance of the engine isn't bad at all, even though it was a downgrade in HP from my Z. With the top down it's easy to overlook this problem for a while but... I am going to go out of my mind on my commute!