I done the search and read MANY posts (not all) so I hope i'm not

here. I've read about the JLs and BSWs and custom boxes and builds. But I was wondering, what if you just changed the actual sub speakers in the OE enclosure and ran a different amp to drive them? I'd imagine the sound would be somewhat better. I have the DSP system in mine and don't want to go through too much hastle (or cost) to upgrade my system. From what I've read, all I'd need is some module to bypass the stock amp and to run my amp to the speakers. I already have a nice 5-ch Kenwood amp looking for a place to roost. It's more than capable of pushing all of the speakers, including any upgraded pair of 6 1/4" (I'm assuming) speakers. I also already have some nice Kenwood component speakers I can use if I want to replace the door speakers as well. Has anyone tried doing just that?
I was going to save the amp and speakers for my 850Csi when I got it but that could be a couple years from now.