What type of sub will fit perfectly in the enclosure behind the driver seat for those w/o the Bose System...also, is true that the speaker needs to be "free-air" style...I have a custom Kicker L5 box in place of the spare tire but wanted to know of options for factory placement...thanks for the info...

 

You might get more responses if you post this in the audio/video forum. If you double posted there disregard this post. Just a suggestion.