Good morning, My GT has this slight buzzing noise going on under the hood since a PI intake/head swap. At first I thought it was just noisy valves, but using a stethoscope it seems like the sound is coming from the bottom of the intake manifold, which is strange since there are no moving parts there... maybe someone here could shed some light on this problem? Here is a video of the sound, its not that loud in real life, just sounds like almost a metallic buzz?: https://www.youtube.com/watch?v=cpbZyS2EHcc&index=1&list=UUyjDN8yoDt8EyWYcgkapf1w Car drives/runs great, no power problems or anything like that. Just want to be sure I'm not causing excessive wear or anything. Thanks!