Whistling
I wouldn't worry about the whistling at all. It's the alternator. It varies it's rotating speed depending on the drain on the system, which is actually a good idea. If you want to completely get rid of the sound, and well, prove that it's your alternator, make sure your radio is off so you can hear the whistling. Now, listen to the current sound. You'll probably hear a light whistling, assuming that your headlamp switch is rotated all the way counterclockwise. Now, turn it clockwise to auto, or to full if you are outside in the sun. You should hear the whining/whistling sound increase in intensity. This is the because the alternator has changed it's rpm due to increased drain on the system. Sorry for the elaborate explaination but at least you can rest assured it's not a problem with your car at all. It may just be a little annoying. hehe. If you want to completely get rid of the sound, at least in the day time, turn your headlamps off and get rid of the DRL (daytime running lights) relay. The exact location is probably located in your user manual, but, open the hood and the relay box is going to be on the car's right side. It's pretty easy to remove the top. Now, if you're standing on the car's right, there should be a cluster of small fuses on your left. There are bigger fuses and relays starting to the right of the cluster in two rows. The DRL relay is on the bottom row, to the right of the 1st big relay. Pull this out and your lights should completely be off when your headlamp dial is all the way counterclockwise. I pulled this out because it was annoying me to have my lights on in the day, but it also cured the whistling noise at least during the day. hehe. Anyways, I hope this is helpful. Now, if it truly is your intake, the intensity of the whistling sound should increase as you step on the throttle until the sound of the engine damps it out. If it's the alternator you should only be able to hear it at low rpm, including the procedure that I told you about to hear it more.
Cheers
