SO if anyone has the sun and sound package.... The very nice Bose system. and you want more bass, this makes the most sense. If you don't want to drop a lot of time and money changing out the head unit and finding compatible harnesses (and that seems like a real pain...after reading and researching what goes into the project)
I would go with one of three set ups, one 10 inch, one 12 inch, or two 10 inch. 15 inch is too loud and muddy for a vehicle this size....unless you go all out and build a full system to match the sound right....but then why bother getting the bose system, so yeah.
I have two 10 inch. just enough volume and great sharpness and punch.
The install is the same as any other but the head unit has no rca jacks....easy enough spice off the speaker wires.
the stock amp is in the wheel well behind the passenger back seat. You need a T45 Star bit to unscrew the Styrofoam anchor. once you remove the right side Styrofoam put down the backseat and there you have easy access to the stack amp.
GY/BK is the stock Bose right subwoofer (-) low reference wire
GN/VT is the stock Bose Right subwoofer (+) speaker control
Instead of pulling apart the trax to get to the sub i will just use a vampire plug on the wires right out of the amp and run them to my added amp for my 10 inch subs. Because the wires are powered, i will either run them to the high input on the amp or use a line converter to the rca low input. But that is up to you as your preference.