Originally Posted by JHM2K

Not sure if it makes you feel any better, but I've noticed similar issues in mine. The idle fluctuation with a/c on is seemingly worse with "low restriction" intakes. Grip-Grip had this problem with his NW intake, I did as well. He installed SL55 airboxes and it fixed it. I ran the stock boxes for a week and the idle issue was fixed on mine as well. Put a C3 style intake on the back of mine, and the idle fluctuates again (100-200 RPM). But, the sound is sure worth it.

As for the squeal, I can hear it VERY clearly with the C3 installed. My only thought is it has something to do with the threshold of engagement (supercharger). If I eeeeaaaase into the throttle while in overdrive, I hear it. If I blip the throttle (from cruising to over 25% throttle) the squeal is nonexistent and the supercharger whine is clear and pronounced.

Again, stock intake cured both of my issues. C3 intake made both issues worse. NW intake allowed me to experience both issues as well.

A very un-scientific answer, but an answer nonetheless.