I also had an issue once right after the car was lowered where I had scraped the cuved cross-section right around the mid-pipe area of the exhaust...banged it upward and that was connecting to the exhaust, causing a audible vibration...but that piece was replaced a very long time ago, and that was the first place I checked.
It's spotless; no dents or dings, certainly no connecting between it and the exhaust.
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"The line dividing good and evil cuts through the heart of every human being." - Aleksandr Solzhenitsyn
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