I have a 1980 K20 and I currently have a Panasonic CQ-DF401U face (45x4) and Kicker Impulse 6.5" speakers in the doors. Just fork kicks I wired the whole deal with 12g. So now I am looking for a LOT of good clean bass. I was thinking two 12" subs and a amp to fit would be nice but due to the limited space behind the seat I cannot get a very big box. So maybe two 10's instead? I want to spend $600 or less on subs, amp and boxes. What do you guys suggust what brands of subs and what amps to match them? Should I get two 12's or two 10's? All the info you could give me would be great. Thanks If it aint Chevy it aint worth anything.