My friend has both of these subs we are making in a custom fiberglass enclosure. Which would be better with a Volfenhag 2000 watt amp? He is gonna use 4 subs and take up the whole back seat of his s-10 pickup. Could someone find the specs of the older model 2003 cvr kickers. The kicker website doesn't have it. I am looking for something like this but for kicker.