hey guys on my 04 TL I purchased a brand new 8in rockford fosgate punch to replace the factory sub. i small problem, i cannot for the life of me figure out how to get the damn rear deck off....i have searched high and low to no avail...lots of pics w/ rear deck removed, just now diy. any help is appreciated!

 

Rear seat and both C-Pillars have to be removed.

Rear seat:
https://acurazine.com/forums/3g-tl-tires-wheels-suspension-97/how-remove-back-seats-put-suspension-3g-garage-f-070-a-567460/

The c-pillars and rear deck just pop off. You will have to remove the square airbag clips on the pillars before you remove them.

 

What if I want to just remove the top of the rear deck to pad it up a bit to reduce some rattles? Does this also require the removal of the back seat?
Trew-that profile pics cracks me up.

 

Yes you have to remove it.