Direct-fit sound system package bolts in to 2014+ GMC Sierra or Chevy Silverado crew cab trucks. Front 3-way speaker: 8″ door woofer, dash mounted 2.5″ midrange + 1″ silk dome tweeter for optimum imaging/staging. Rear: 6.5″ coaxial speaker. Subwoofer: zero-space subwoofer and GM truck-specific enclosure provides deep bass and takes up zero under-seat space. 5-channel v-power system amplifier provides a clean 40W x 4 + 150W x 1RMS System power. all factory speaker location mounting adapters included. vehicle specific wiring harness included. not compatible with Bose factory-equipped trucks. Model Number PSS-31GM.