hey guys.. i have a 04 gtp and my car does/did the same thing. i took it in to the dealer to get checked out...they said that its a common problem with the 2004. they say its not really a problem per se-- but they went and tightened something under the car. im sorry that i cannot remember what it was, but they say not to worry. i would hear the "boing" when i would turn the steering wheel all the way to the right (or might have been left, if not both) the funny thing is that they had a printout on the issue, and when i asked for a copy they noted that they arent suppose to let consumers see it. its something about because it was the new design they hadnt expected a few things. ever since they tightened it i hadnt heard anything. it was covered under the warranty.