Hey guys, thanks for the input and tips. I was checking out my car this weekend and with a couple of cranks of tge manual seat height adjuster there is definitely room for a little active sub under the seat near the rear. Soundsteam makes a little unit that's only 3" tall with a 8" sub so I'm leaning towards that one.
I'm then planning to run the following:
Some
TBD double din head unit with GPS
New amp to replace stock amp
Rear speaker kit
TBD high quality speakers to replace stock ones in dash and door
Gotta be better than where I'm at now.