Sierra Extra Cab

For over 20 years MTX has been manufacturing vehicle specific custom enclosures that are designed to be installed in space that would otherwise go unused in your vehicle. All models are made in our manufacturing facility in Monroe, WI by our highly technical trained staff to ensure that your experience is more than you expected.

All Thunderform models are manufactured using highly technical rotomold or fiberglass processes to create lightweight, durable enclosures that are available in three formats: amplified, loaded, and unloaded.

  • Amplified models include an integrated high efficiency amplifier and custom subwoofer that deliver an exceptional performance with easy installation. Mounting hardware and amplifier kits are included in each model to make installation easy.
  • Loaded models include a custom 4Ω, 200W RMS subwoofer that can be used with existing amplifiers or with upgraded amplifiers.
  • Unloaded models work with most 10" subwoofers that you may already have or that you want to use with an upgraded subwoofer.
C15EX07FB10A-TN

Chevrolet Silverado Extended Cab Amplified 10 inch 200W RMS Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 2007-2015

Amplified Thunderform with a single, hard hitting ten inch Terminator Subwoofer powered with 200 watts RMS.

Fits Chevrolet Silverado 1500/2500 Double Cab 2007-2015. Finished in Black.

$649.95 $549.95
Free shipping
CXP20AC-TN

Chevrolet Silverado Extended Cab Amplified Dual 10 inch 200W RMS Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1999-2006

Amplified Thunderform with dual, hard hitting, ten inch Terminator Subwoofers powered with 200 watts RMS.

Fits Chevrolet Silverado Extra Cab 1999-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in charcoal.

$799.95 $699.95
Free shipping
CXP20AT-TN

Chevrolet Silverado Extended Cab Amplified Dual 10 inch 200W RMS Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1999-2006

Amplified Thunderform with dual, hard hitting, ten inch Terminator Subwoofers powered with 200 watts RMS.

Fits Chevrolet Silverado Extra Cab 1999-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Tan.

$799.95 $699.95
Free shipping
CXP10LAC-TN

Chevrolet Silverado Extended Cab Amplified 10 inch 200W RMS Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1988-1998

Amplified Thunderform with a single, hard hitting ten inch Terminator Subwoofer powered with 200 watts RMS.

Fits Chevrolet Silverado Extra Cab 1988-1998, also fits Ext Cab GMC pickups and 3-door models. Finished in Charcoal.

$649.95 $549.95
Free shipping
CXP10LC-TN

Chevrolet Silverado Extended Cab Loaded 10 inch 200W RMS 4 Ohm Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1988-1998

Loaded Thunderform with a single, hard hitting ten inch Terminator Subwoofer rated at 200 watts RMS @ 4 ohms.

Fits Chevrolet Silverado Extra Cab 1988-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Charcoal.

$549.95 $449.95
Free shipping
CXP10LAT-TN

Chevrolet Silverado Extended Cab Amplified 10 inch 200W RMS Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1988-1998

Amplified Thunderform with a single, hard hitting ten inch Terminator Subwoofer powered with 200 watts RMS.

Fits Chevrolet Silverado Extra Cab 1988-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Tan.

$649.95 $549.95
Free shipping
CXP10LT-TN

Chevrolet Silverado Extended Cab Loaded 10 inch 200W RMS 4 Ohm Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1988-1998

Loaded Thunderform with a single, hard hitting ten inch Terminator Subwoofer rated at 200 watts RMS @ 4 ohms.

Fits Chevrolet Silverado Extra Cab 1988-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Tan.

$549.95 $449.95
Free shipping
C15EX07FB10-TN

Chevrolet Silverado Extended Cab Loaded 10 inch 200W RMS 4 Ohm Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 2007-2015

Loaded Thunderform with a single, hard hitting ten inch Terminator Subwoofer rated at 200 watts RMS @ 4 ohms.

Fits Chevrolet Silverado 1500/2500 Double Cab 2007-2015. Finished in Black.

$549.95 $449.95
Free shipping
CXP20C-TN

Chevrolet Silverado Extended Cab Loaded Dual 10 inch 400W RMS 4 Ohm Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1999-2006

Loaded Thunderform with dual, hard hitting, ten inch Terminator Subwoofers rated at 200 watts RMS @ 4 ohms each.

Fits Chevrolet Silverado Extra Cab 1999-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Charcoal.

$549.95 $449.95
Free shipping
CXP20T-TN

Chevrolet Silverado Extended Cab Loaded Dual 10 inch 400W RMS 4 Ohm Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1999-2006

Loaded Thunderform with dual, hard hitting, ten inch Terminator Subwoofers rated at 200 watts RMS @ 4 ohms each.

Fits Chevrolet Silverado Extra Cab 1999-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Tan.

$549.95 $449.95
Free shipping
C15EX07FB10U

Chevrolet Silverado Extended Cab Unloaded 10 inch Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 2007-2015

Unloaded Thunderform designed to house a single ten inch subwoofer (not included).

Fits Chevrolet Silverado 1500/2500 Double Cab 2007-2015. Finished in Black.

$449.95 $349.95
Free shipping
CXP20UC

Chevrolet Silverado Extended Cab Unloaded Dual 10 inch Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1999-2006

Unloaded Thunderform designed to house dual ten inch subwoofers (not included).

Fits Chevrolet Silverado Extra Cab 1999-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Charcoal.

$449.95 $349.95
Free shipping
CXP20UT

Chevrolet Silverado Extended Cab Unloaded Dual 10 inch Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1999-2006

Unloaded Thunderform designed to house dual ten inch subwoofers (not included).

Fits Chevrolet Silverado Extra Cab 1999-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Tan.

$449.95 $349.95
Free shipping
CXP10LUC

Chevrolet Silverado Extended Cab Unloaded 10 inch Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1988-1998

Unloaded Thunderform designed to house a single ten inch subwoofer (not included).

Fits Chevrolet Silverado Extra Cab 1988-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Charcoal.

$449.95 $349.95
Free shipping
CXP10LUT

Chevrolet Silverado Extended Cab Unloaded 10 inch Vehicle Specific Custom Subwoofer Enclosure

Fits Chevrolet Silverado Extended Cab 1988-1998

Unloaded Thunderform designed to house a single ten inch subwoofer (not included).

Fits Chevrolet Silverado Extra Cab 1988-2006, also fits Ext Cab GMC pickups and 3-door models. Finished in Tan.

$449.95 $349.95
Free shipping