MistaElvis

I currently have just 2 12" kicker comps that i bought at curcit city. I want... i NEED, more power and bass So now I'm deciding between 2 15" Kicker L7's or an 18" Fi BTL I'm looking for loudness! Can you tell me about these subs? Like sound quality, and how loud they are? oh yea, im driving a 4runner right now... what ever i get i know that i have to get new batteries and a better altenator! haha but yea, thanks for the help,!