Installation done. Getting the power cable from the cabin to the battery was a little problematic. I am still very new to car stereo. I am a computer geek and pilot first. That being said I ended up running it up the driver side pillar and found a channel that runs behind where the driver side rear view mirror sits. The cable slid through fine and then I attached it to the battery. I wanted to install the sub under the front seats...but it was too high. I then wanted to install it between the second row seats...but it was too wide. Boo. I have had my 3rd row folded since new so I just installed it on the back of the 3rd row between the 2nd row Captains chairs. I am happy overall. It's not a "thumpin" loud subwoofer, it just fills in where the factory speakers fall off.
I can't think of anything else I want to install in my 5. To date I have done the following:
Pioneer Avic D3 touchscreen Navigation system
Pioneer Bluetooth System (integrated with the Avic D3)
Pioneer XM Radio (integrated with the Avic D3)
Boyo Nightvision Backup camera (displayed on the Avic D3)
Kenwood KSC-Sw10 Sub woofer - mounted in the hatch area
Shark fin Antenna color matched to my car (replaced the factory traditional antenna)
Mazda Auto Dimming rear view mirror with compass (not car stereo…but the install was kinda tricky)
Superwhite LED's for map lights, 2nd row overhead light and license plate lights
Shark fin antenna
Yellow Gels over fog lights
All weather Mats
Rear Bumper Cover
Rear Cargo Cover
Rear Cargo Mat
Tinted Windows
All that for a car I drive 500 miles a month.......