What's the name of the part I ruined?
 

I was in Asheville a couple weeks ago visiting my dad and took a little side trip, ending up going up a steep gravel driveway to look at a log cabin. After a couple of awful, loud grinding noises going over some humps (do NOT try to offroad a lowered Box, d'oh) I decided to walk the rest of the way, but unfortunately had to come back down over the same humps. Last night my wife noticed, as I was pulling into the driveway, that something was hanging down from underneath the front end. Sure enough, I had torn lose part of the plastic piece extending back from underneath the bumper and had put a fairly good sized dent in what I guess is an aluminum or steel bash plate under the front end. So when I call my local dealership tomorrow to make an appointment, what is that actually called that will have to be replaced at great expense? Luckily my comprehensive deductible is only $250. Don't reckon that kind of repair would be done under warranty, would it?

That damage will not be covered by your warranty or your comprehensive coverage. It will be covered by your collision insurance.

The plastic part is probably the front cover: 996 504 527 02

Open your front trunk and see if you can see a dent in the floor.

Thanks. Upon closer inspection in the daylight it is the black plastic piece that slots up under and behind the back edge of the bumper. That's much better than having to replace the bumper. Don't think the trunk is dented but it did scrape off the rustproofing or whatever that undercoating is.

The front cover is held on by about 20 plastic nuts, maybe you can fix it yourself? Make sure you fix the scrape with the proper preparation and coatings.