Deciding between a 15" SI Mag D2 and a 18" RE SX.  Opinions on both would be greatly appreciated. WHich one has better SQ, SPL, which one gets louder, etc. And my other question is, is the 15" SI Mag reliable for a daily driven ride?  Will it play for me at least a year without requiring me to recone or replace something?  And is it still durable enough to take to competitions a couple weekends a year? And this will be going into a 2003 Ford Focus 2 Door Hatchback, so I'm pretty sure it will pound.   And I'm sorry if this is a repost, I didn't see a search feature.  Oh, and great collection of smilies