I hit something that banged hard one time in my Pontiac G8 on a busy section of 95 in Philly. Had to pull over in my dress clothes and get under the car to see what was going on. Turns out I ran over one of those 2 foot long contractor's paint and spackle stirrers that goes on a drill - the huge one. It ended up bent all up twisted in the heat shield above my rear muffler. I managed to yank it out but that thing went from front to back and really could have done a ton of damage. I got lucky.
OP hope everything turns out not so bad.
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