The speakers in your Pontiac Grand Prix are made of a paper cone mounted to a magnetic coil assembly. These speakers are sufficient for listening to music, but if you want to upgrade the speakers, you need to install high-end performance stereo equipment. The speaker system you buy will depend largely on your budget and your personal preference. Stay away from universal speakers--the Grand Prix uses speaker cages that accept only certain specific sizes that are made for the Grand Prix.
Wedge the tip of a flat-head screwdriver under the front of the speaker cover. All of the speakers in the Grand Prix use front-mounted speaker covers.
Pry the speaker cover off the speaker.
Remove the screws holding the speaker in place with a screwdriver.
Pull the speaker forward and unplug the speaker wire from the back of the speaker.
Plug the speaker connector into the back of the new speaker.
Mount the new speaker and secure it with retaining screws.
Snap the speaker cover back into place over the speaker.
Pry up on the rear window trim panel with a flat-head screwdriver to remove it.
Lift up on the speaker retainer. You might need to pry it up with a flat-head screwdriver.
Lift up on the speaker and remove the tabs that hold the speaker in place from the opening of the rear window panel.
Unplug the electrical connector from the back of the speaker.
Remove the rear speaker assembly.
Plug the speaker wire connector into the new speaker and lower the new speaker assembly into the old speaker assembly mount.
Press the speaker retainer and rear window trim back into place.
