Installs under the rear seat. Does not affect rear seat. Fits Two 10" subs 6" max magnet diameter Cutout Size: 9-1/8. Amp shelf area 14"w x 17" d longer amps can run off the box. If you've been wondering where in the heck you can mount an amp in this truck and still have room for a pair of subs, then you're not alone.At Subthump, we are always thinking about the end user and how they will use our product. We try to come up with ways to make installs go much easier. Most places don't care. They just want to keep cranking out their one generic design without regard to the person installing it. Our amp space box makes installing your amp and subs simple, fast, and easy. Just mount your amp on the shelf, run you're wires and call it a day. The amp space is 14" wide by 17" long. Longer amps can actually run off the box in the back if needed. You can also drill thru the shelf to help hide some of the wires as shown. Not only does this box look and fit great, but it adds a whole new dimension of functionality and usability. The item "2007-2013 Silverado/Sierra Crew Cab Dual 10 Downfire Sub Box With Amp Space" is in sale since Wednesday, November 14, 2018. This item is in the category "Consumer Electronics\Vehicle Electronics & GPS\Car Audio & Video Installation\Speaker/Sub. The seller is "subthump" and is located in Connersville, Indiana. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Grenada, Saint kitts and nevis, Saint lucia, Turks and caicos islands, Barbados, Bermuda, Ecuador, Egypt, Guadeloupe, Martinique, Oman, Pakistan, Viet nam, Russian federation.