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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Remove your air box lid, remove the air box and air filter. Now if you look in the hole in the fenderwell you should see a piece of black plastic, that is the air silencer. Remove it by removing the nuts that are holding it onto the fender well (I think that there are four of them and they are all on the engine bay side of the fenderwell). You will have to pull it out through the bottom of the car (it should drop out behind the front bumper.