Chevy Silverado & GMC Sierra Extended Cab Dual 8" Ported Front-Fire (2007-2018)

Finally, a high-output bass solution designed specifically for the "High Transmission Hump" floor. This custom-fit Dual 8-inch Ported Enclosure is engineered exclusively for 2007-2018 Chevrolet Silverado and GMC Sierra Extended Cab (Double Cab) trucks that feature the raised floor center.

While most boxes require a flat floor, this enclosure is built to bridge the transmission hump, utilizing the limited space under your rear seat to deliver massive, ported bass without requiring seat modifications.

Vehicle Fitment Guide

• Make: Chevrolet Silverado & GMC Sierra 1500/2500/3500.

• Year Range: 2007 - 2018.

• Cab Style: Extended Cab / Double Cab ONLY.

  • Identified by the smaller rear suicide doors (older models) or standard hinged rear doors (newer models) and a raised transmission hump in the center of the rear floor.

• ❌ DOES NOT FIT: Crew Cab models (Large rear doors with Flat Floors).

Key Features

• Hump-Ready Design: The bottom of this enclosure is custom-contoured to sit perfectly over the large transmission hump found in Extended/Double cab trucks, ensuring a level and secure fit.

• Front-Firing Performance: Due to the uneven floor and seat mechanisms, down-firing boxes often struggle in these trucks. Our Front-Firing design projects the bass forward into the leg area, delivering louder, cleaner impact that isn't muffled by the floor carpet.

• Ported for Power: We maximized the efficiency of the dual 8-inch drivers with a ported (vented) design. This allows the subs to play deeper and louder than sealed alternatives—perfect for cutting through road noise.

• "Armor" Spray Liner Finish: Finished in a premium Polyurethane Bed-Liner. This coating is tough, water-resistant, and scratch-proof. It looks like it belongs in a truck and will outlast cheap carpeted boxes.

Technical Specifications

• Subwoofer Size: Dual 8-inch

• Enclosure Type: Ported / Vented

• Firing Direction: Front-Fire

• Finish: Black Textured Spray Liner

• Placement: Under Rear Seat (Over Hump)