Picture of Replace Rear Nissan Altima Speakers
When you need to upgrade your rear 6X9 speakers in the back, there is a little trick in order to swap them out properly.

8mm socket
10mm socket
Small flathead screwdriver
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Step 1: Remove the SRS housing on both sides

Picture of Remove the SRS housing on both sides
Using a small screwdriver, pop the SRS airbag screw cover off. Try not to scratch the plastic, it should come easily. There is a single 10mm bolt that needs to come out behind it. Once its out, carefully pry the top off and follow on down the housing. There are two clips that should pop off and two hinges on the bottom that just slide out once it is on its side.

Step 2: Speaker cover removal

Picture of Speaker cover removal
Now its time to take off the main black panel. First you want to go look underneath in the trunk area and find a bunch of small white clips sticking down. Use something to pop them up, i used the butt end of a screwdriver. There are around 8, make sure you punch all of them out. When you try to take it out, if it seems stuck in one place, chances are you missed one.

Starting from one side, lift up the panel and work your way down. There will be loud sounds, but aslong as nothing sticks with a large amount of force its normal. The entire panel will then simply slip out. The corners of the panel, however, have to be lifted overtop of the cushion and seatbelt holder. Also un-slot all the seatbelts.

Before yanking it out however, disconnect your brake light, it should undo easily. (There are two connectors, only one works easy, beware).
When pulling out your panel try to not scrape the white clips, for reinstallation purposes.

Now disconnect the speakers.