kicker

My Kicker system and Pioneer Deck http://www.yourcobalt.com/forums/members/huneycutt9-albums-my-cobalt-picture6547-kicker-dx400-4-mounted-side-trunk.jpg http://www.yourcobalt.com/forums/members/huneycutt9-albums-my-cobalt-picture6546-all-kicker-hardware.jpg...

ok so heres what i have now 2 kicker 12s cvr in a slot port box 2000watt profile amp kinteict audio series battery dual xdvd700 dual 6.5 door speakers with 1in tweaters Ok heres the thing i love my set up but would adding 2 8in subwoofers make a difference? give me better er higher freq bass...

2005 cobalt base. I was looking at duel kicker 12's in a box, but they look wayto large to fit. but i don't really want to downgrade to 10's. any input? thanks.