Depends on your local laws and your apprehension, or lack thereof, to break them. If you have no emissions inspection, delete. If you have one, high flow. If you don't give a damn, see:Eric.Smit, delete.
not yet they were closed probably tomorrow too. here's there info though.
Extreme Motorsports Inc.
1360-L Blair Dr
Odenton , 21113
Phone : 410-672-2700