Scrap metal place off of 488 towards LaPlata. Or the one in Prince Frederick, or any other scrap metal place.
Just be prepared to prove it came from a car that you own. Too many being stolen at the P&R's and then sold to the scrap metal places.
True, but some places (atleast the one in PF) takes down your DL info, and I believe you're on CCTV the whole time.
There really isn't a way to prove it came form your car...
If you have a registration that says you own 'X' model of 'Y' year and the cat convertor matches that car, you can probably convince them it came from your car.