Pioneer 8" x 5.25" 170-Watt Compact Active Subwoofer with Wired Bass Remote, Max Power, TS-WX140DA - Walmart.com
Pioneer TS-SW2502S4 Shallow-mount 10" 4-ohm subwoofer - Stereo West Autotoys
Buyr.com | Component Subwoofers | PIONEER Alphasonik AS8DF 8 inch 600 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer for Tight Spaces in Cars and Trucks, Slim Thin Loaded Subwoofer