Why would you do something like that? Aside from being obnoxiously loud, it is borderline dangerous to have exhaust fumes venting under the body of your car. If you're ever in traffic and start to feel sleepy, or if you have any respect for the poor people in your neighborhood, reconnect your muffler. If you really have to have that sound, have a muffler shop run straight pipes out so that the tips sit in the OEM location.
Also, to "delete" something means to remove it. What you have there is a "muffler disconnect".