am about to buy an e46 bmw (2004 320!) and am thinking of replacing the standard rear 6.5" wuth 6x9 subs. has anyone used these before, or would it be better to just stick in some standard 6x9s. i have also noticed that JL Audio do 6.5" subs - i really want low end sound but don't want to sacrifice the boot space. stealth sub enclosures are too mush and diy isn't an option!