Might just be the exhaust resonating or something of that sort...or a vibration through the chassis...I think I know the sounds you're talking about...it's almost like a low-pitched buzz right?
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me-- "Sometimes you feel like a nut, sometimes you don't. Sometimes I feel like the moon is made of cheese"
my Hindibonics-speaking Indian roommate--"Dawgs, do you have any idea how much bacteria that would take?"
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