AK-G25-28 by kingboxes SKU AK-G25-28 AK-G25-28 2007-2018 Chevy/GMC Silverado/Sierra 1500 Crew Cab Dual 8" W: 53" D: 16" FH: 9" BH: 5" 1.7 Cubic Feet per chamber Silver Push Terminals Tuning: 36Hz