Mine is probably the same. Looking forward to hearing what your results are...
Hopefully we can get this figured out lol.
A little bit of that hollow sound you're referring to is normal for the header system. The sound that others and I'm personally referring to is a little different. Once I post a video you'll see what I'm talking about. Sorry I haven't had time been really busy to get on my computer or forget to.
Could very well be, I honestly have no clue where the noise was coming from. Is your noise similar to the video I posted or is yours different? I have a full exhaust setup (headers + catback) so the flex pipe wouldn't apply to me. Heat shield maybe, but I would have to put it up again to double check that.
Similar enough but I'd have to hear it in person to know if it's the same. Mine is noticeable at idle with the windows fully down or doors open, or when I'm either very lightly accelerating through 2000 and 2800 rpm or engine braking through those engine speeds. It sounds like a piece of loose metal going into resonance and vibrating against another piece of metal.
I see, I didn't really notice anything during light acceleration, and after driving my car a little bit the noise would pretty much go away. At this point all I can do is try to see if I can get the noise to replicate or if it comes back, maybe then you can hear it in person and see if it's the same or not.
Nice, glad you got it figured out. I will take a closer look at mine.
Awesome! Glad to hear!