Sooty leak under the middle of the car

I dropped off my 2015 T at my dealer's preferred body shop to have a rim repainted (some idiot forced me off a rotary making a right turn from the left lane and caught a curb with the rear wheel) as well as getting my silver calipers painted yellow and carbon shields put on. Came home to an empty garage and noticed some coin-sized drips at about the midpoint of the car, they had dried but there was a black sooty residue on the floor.

From searching seems like this is somewhat common from the exhaust? Haven't noticed it before but I did put the sport exhaust on the car a few months ago and have been driving quite a bit in colder weather here as the roads have been dry. I'm familiar with the soot spitting from the tailpipes on a cold start, just curious how it runs back to the middle of the car, or whether it's a sign of a potential exhaust leak.

Image Unavailable, Please Login