Focal P 20 FSE Flax Evo Series shallow-mount 8" 4-ohm component subwoofer at Crutchfield
Amazon.com: DS18 SB10A 10" Shallow Subwoofer Enclosure with Built in Amplifier – Car Audio All in One Amplifier and Subwoofer Bass Package 700 Watts Power – Great Stealth Car Subwoofer in Box