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I had a set of HR Sport springs installed in my 2014 Panamera S yesterday. The ride home was interesting. Going over bumps in the road (dips, sewer covers, etc.) it sounded like the bottom of the car was falling out with a very loud bang. I put in a call to the dealer to confirm the correct springs were installed, but if so, perhaps it's a bumpstop issue? Any thoughts on the cause? Thanks!