I just bought an Infinity Basslink sub. I really wanted a sub, but I also wanted something that didn't take up a lot of space and was easily removable if I wanted to take it out. It sounds pretty amazing for what I wanted. I wasn't looking to break any glass, I just wanted something to add some more bass. It puts out a lot more than I thought it would. It's in it's own box, with a 10" woofer on one side, a 10" passive radiator on the other side and a built in 200 watt amp. With quick connects for the wiring, you can take it all the way out with ease. And it takes up very little space anyway. Certainly worth looking into if you don't want to take up all your available space in back.

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Eric Konarske & Lara, my X
'01 Solar Yellow XE 3 Pk. 4x4