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  Top » Catalog » Chevrolet / GMC Sub Boxes » Silverado / Sierra Extended Cab
Silverado / Sierra Extended Cab Sub Boxes Let's See What We Have Here

Subthump offers a complete line of custom-fit enclosures for Chevy Silverado and GMC Sierra pickup trucks and More.  If you have a Full-Size Extended cab truck, we have the right box for you.  Our boxes are some of the best in the industry and our customers agree.  No other company can match our style, quality, and service...

Displaying 1 to 7 (of 7 products) Result Pages:  1 
 CXB07-110 
 2007-2013 New Body Style GM Extended Cab Single Downfire Box 
 2007-2013 New Body Style GM Extended Cab Single Downfire Box 
Availability: In Stock

 $109.00 
 Buy Now  
 CXB07-210 
 2007-2013 New Body Style GM Extended Cab Dual Downfire Box 
 2007-2013 New Body Style GM Extended Cab Dual Downfire Box 
Availability: In Stock

 $139.00 
 Buy Now  
 CXB07-212 
 2007-2013 New Body Style GM Extended Cab Dual 12 Downfire Box 
 2007-2013 New Body Style GM Extended Cab Dual 12 Downfire Box 
Availability: In Stock

 $149.00 
 Buy Now  
 CTB99-210Amp 
 99-06 GM Extended Cab Dual 10 Downfire With Amp Space *Best Seller* 
 99-06 GM Extended Cab Dual 10 Downfire With Amp Space *Best Seller* 
Availability: In Stock

 $139.00 
 Buy Now  
 CTB99-210/212Ultra 
 99-06 GM Extended Cab Ultra Deep Dual 10/12 Downfire Box *Best Seller* 
 99-06 GM Extended Cab Ultra Deep Dual 10/12 Downfire Box *Best Seller* 
Availability: Typically ships within 24 hrs

 $139.00 
 Buy Now  
 Ultra MAXX 
 99-06 GM Extended Cab Ultra Deep MAXX Dual 10/12 Downfire Box NEW 
 99-06 GM Extended Cab Ultra Deep MAXX Dual 10/12 Downfire Box NEW 
Availability: In Stock

 $239.00 
 Buy Now  
 CTB99-110/112Ultra 
 99-06 GM Extended Cab Ultra Deep Single 10/12 Downfire Box 
 99-06 GM Extended Cab Ultra Deep Single 10/12 Downfire Box 
Availability: In Stock

 $109.00 
 Buy Now  
Displaying 1 to 7 (of 7 products) Result Pages:  1 
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06 & Up Dodge Ram Mega Cab Dual Sub Box With Amp Space Deep Heavy Duty
06 & Up Dodge Ram Mega Cab Dual Sub Box With Amp Space Deep Heavy Duty
 $225.00 
Latest products more
99-06 GM Extended Cab Dual 10 Downfire With Amp Space *Best Seller*
99-06 GM Extended Cab Dual 10 Downfire With Amp Space *Best Seller*
 $139.00 
01-06 GM HD Crew Cab Dual Downfire Box *Best Seller*
01-06 GM HD Crew Cab Dual Downfire Box *Best Seller*
 $139.00 
93-02 Camaro/Firebird T-top Box
93-02 Camaro/Firebird T-top Box
 $270.00  $225.00 
2011 & Up Camaro Convertible 10" Drivers Side Stealth Enclosure
2011 & Up Camaro Convertible 10" Drivers Side Stealth Enclosure
 $165.00  $135.00