I've got 1500 miles on my 2004XC and have brought my car to the dealer two times attempting to cure an intermittent rattling noise encountered only during acceleration. I notice it between 2-3k RPM (20-35mph) and it is clearly coming from the forward half of the car. The tech sat in the car with me and heard it and said it sounded like a clearance issue (e.g. - heat shield, etc.). Anybody else have any issue like this? Perhaps the third time is a charm, but I'm not holding my breath.