does anyone know what scraches underneath the car when you go up/down steep areas? Like stupid parking lots, driveways, etc.
Feels like something directly underneath the shifter.

 

Once on a canyon run I went over some nice size rocks in the middle of the road. Didnt see'em until I heard'em scrape my bottom and see them in my rear view mirror.

My stock Cats had some nice scratches on them When I had them replaced with the R/T's. maybe thats what you have. usually when you scrape bottom it's your exhaust that gets hit.
Go to a shop and ask them to throw it up on a lift for you.

 

I got some scratches here thanks to some unavoidable construction zones.... argh I hate this city.

Anyhow.. I've scraped up some of the black paint off some underbody parts. It's already rusting... so I gotta get them painted quick.