I have a base model and I'll tell you my complete setup. The subs just give the right amount of added ambiance that I wanted.

First: I'm 5'11 and because of the angle of the seat since your not sitting with the back of it at 90 degrees, the top of the seat will hit the back wall and thus the section of the seat by the sub wont be touched and I sit with my seat very far back. So the subs wont be damaged.

Second: Here is a pic of the sub behind the passenger seat and its behind the same spot on the drivers side. I used the stock sub location that's available and shallow mount subs. I will provide the info for it at the bottom.


Third: For the amplifier, I placed it up against the back wall so I didn't compromise my trunk space.


Finally: Here is the info for the complete Audio setup for my car. If you copy it, everything will work guaranteed. I bought everything off ebay and amazon.

Kenwood Excelon KDC-X395 Receiver (headunit)
Kenwood Kfc-P709Ps 6.5-Inch Component Speaker (comes with door speakers and tweeters)
KICKER CVT6 6.5" 600W Shallow Subwoofers
Sony Xplod 4/3 channel 600W XM554ZR Amp (transferred it from my previous car, which was a Cobalt SS)