We have had our XC-90 for two weeks and absolutely love it. There is, however, one problem we have uncovered that needs to be fixed to make the car perfect. On the T-6 models, the only engine noise we have heard is an annoying "whistle" or "squeal" that is produced when you let up on the accelerator. I took the car to our local dealer and their service people said it is the "exhaust from the turbocharger"...air being released from the turbocharger due to the deceleration. They tested some other T-6s and found that they all sound the same and agree that the sound is unusual. I have driven an S-80 T-6 for the past 2 1/2 years and have never heard that type of noise, so it is possible to produce that engine without the "whistle" but, for some reason, it did not happen on the XC-90.<p>My reason for posting this issue is that I hope someone from Volvo engineering in Sweden and/or Volvo dealers will read this and contact the right people at Vovlo to get them to develop a fix (our dealer said they would try as well). The XC-90 is a truly, truly outstanding vehicle--best I've ever driven--and not worthy of this one imperfection!