JL Audio Stealthbox model SB-GM-SLVD/10TW1/BK.
Fits under the rear seat of a 2014 through 2018 Silverado/Sierra Double cab truck like it was built with the truck. Sounds awesome and plays just like new. I'm a SQ guy and no Basshead, so this sub was never played hard. Powered with a 600 watt amp for the past 4 years. Price does not include shipping so please message me for a shipping quote. Thank you.