Rockford Fosgate P3SD2-12 Punch Stage 3 shallow-mount 12" subwoofer with dual 2-ohm voice coils at Crutchfield
Amazon.com: Rockford Fosgate R2SD4-12 12" 1000W 4-Ohm Shallow/Slim Car Subwoofer Sub Pair with Mica-Injected Polypropylene Cone and Integrated PVC Trim Ring : Electronics