Here's my stealth sub installed professionally. The before is a lot like the after because it looks the same when the cover is on (not compromising any trunk space whatsoever.

It's one JL Audio 8" woofer but it still kicks like the rest of them. It's powered by an Alpine amplifier which you can't see but its mounted from above in the middle. I like it with my Sony HU and the factory Monsoon speakers. I highly recommend this system.

This is my "bobbing head" ninja better than any security system; my best modification yet!!