This thread is getting filled up with generalizations (myself included). Again, as I said before, the INSTALL will be the key factor, not which brand name you chose. If I were you, Id look at a more practical daily driver sub (even RE will/would tell you MT's are not designed for daily) with lots of potential (HD3, 9100, 3500, XXX, etc). Chances are you do NOT have to chose a raw SPL driver in order to mutilate your bro's install. Make a smart choice on the speaker (not just the biggest baddest one you can buy) and really invest some time into getting the install/box/tuning/etc just right. That is a much better recipe for success than simply buying an SPL driver and stuffing it into your trunk.
Call me silly, Id prefer a daily system that will get 95% as loud as that SPL oriented system, yet maintains awesome SQ the whole time its doing it. That was/is the idea of these 'SQL' supersubs on the market today. But it seems for many people, even that is not enough, they need that extra 5% output while totally sacrificing SQ, but still return here to tell us how 'good' it sounds. //content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif