This may or may not be related, but I just bought a 2001 Subaru LL Bean w/ 64K miles. Very nice ride, overall, though I have noticed two weird noises. First, when accelerating on the hwy 70-80mph (with stereo OFF) I hear a high frequency noise that sounds electrical, ie., I think it's too high a frequency to be the tranny or the engine. Then when I take my foot off the accelerator and coast through 65-60mph, I hear a vibration from somewher up front, sounding a bit like a rattle or a mechanical resonance. Neither noise seems to affect performance, though I wonder about long-term negative effects. Any others out there have the same experience? If so, any insight into causes and solutions (besides turning the stereo back up)? If the heatshield fix could be it, where is the heat shield? Note that the two sounds are different in frequency (a whirr vs. a rattle).