This is really making me mad. I've tried several times to put an ASP overdrive pulley on my 3G to help charging at idle. I've done this with a few different pulley combinations and I have the same problem everytime. I have a a loud, high pitched sound whenever I first start the car up and that's the only time I hear it. I figure it has to do with the alternator pulley somehow because that's the only time it makes the sound. I've tried two different belts and still have the sound. I would really like to know what causes this because it's starting to be annoying.