[CBFryman]

there are subwoofer enclosures that replace door panels and hidden compartments. but the woofers that come with them are usually very crappy and the enclosures very flimsy (in otherwords not much for swaping out). basically if yo uwant big bass you need a big enclosure. a Brahma 10 in a small sealed enclosure will give excelent responce. maybe 0.75-1.25cuft. put a nine.1 on it and i think you will be very satisfied. if price is a problem (the brahma 10 is $349) a Shiva 12 would work well or a koda 10 for $229. look at RE and IDMAX as well.