Alright, I'm aquiring a system for my daughters car (Suzuki Forenza) and I need some input on a super efficient sub to place in the trunk. Thinking i need a 12" sub for the install. Who can lend a hand on some ideas. Budget is around $120 on the high side and I currently have an O/S Alpine 3522s which puts out 90 watts bridged thus the efficiency issue. Can be replaced however as a last resort. Oh, also, the rear seat has an opening in the middle which would allow some interaction between the trunk and cabin space.