To be honest this build is out of sheer bordom. I totaled my bike and my car so I'm stuck with 1 toy and the wife is not "letting" me get another fast toy for a while, so I figured I'd go retarded on the sound and do other crap to the Burb. When I reffered to the SQ portion I should have elaborated what I meant. This veh won't be "true SQ" but I wanted to get a sub that would sound as "SQ" as possible and not just sound like a jack-hammer. I have had 10's, 12's and 15's... I wanted to go 4 21"s but my buddy tried to talk some sense into me and I settled with 18"s for now and see if I like them. For a good example of what I want, think ground pounder that sounds good.