Very unprofessional installation, mounting amp by drilling drywall screws through cab. 4 screws sticking through the cab, noticeable on the outside & exposed to rain & elements. Broke fuse box cover, tried to hide that by gobs of silicon on the inside of cover,holding it on. And the wiring, a joke. Had me completely confused. Was charged for antenna adaptor, was told by Vandergriff Chev that I didn't need one. The overall charge for installation was more than the purchase of new system, which included dvd player, 4 spkrs., & amp.