CSX Series 15D2 15" 2500w RMS Subwoofer by CAS (Open Box) - 1800woofers.com
2) Power Acoustik MOFOS-12D4 12" 2500w Car Subwoofers+Sealed Sub Box Enclosure - Rockville Audio
Amazon.com: DS18 PRO-BX18N.2D Car Subwoofer Audio Speaker - 18" in Neodymium Magnet, 6" Dual Voice Coil, 4 Ohm Impedance, 2500W Rms Power, 5000W Max Power - Reinforced Paper Cone for Outstanding Performance :
Amazon.com: DS18 EXL-X12.2D Car Subwoofer 12" 2500W Max Power 1250W RMS Power Dual Voice Coil 2+2 Ohm Competition Grade Bass Powerful Performance for Car Truck Audio Sound Systems - 1 Subwoofer :
Amazon.com: Orion HCCA154 15" 2500W RMS Dual 4 Ohm Competition Car Subwoofer, Black Coil : Electronics