Parts Express has the Tang Band 6x9 subs on sale, has anyone tried these? Hoping to find something that will fit in the stock location without too much extra work, I'm not willing to go to a trunk box. I know the efficiency isn't that great and would require replacing the stock sub amp.

http://www.partsexpress.com/pe/pshowdetl.cfm?&partnumber=264-864

http://www.lincolnvscadillac.com/showthread.php?t=28845