I'm 85% positive that's the sound I'm hearing. I'll get the car on jacks Sat. morning to investigate more deeply, but was finally able hear it distinctly coming from the center of the car and is variable with speed. I thought maybe a fender liner or something broke loose and was rubbing a tire, but it's not. No rub on any tire. I recently installed it. My theory is that when I torqued it down the heat shield shifted slightly and as the car has settled with some hard driving it's shifted the shield every so slightly to touch. The sound wasn't there immediately after the install.
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