Just a wiring kit and a battery terminal. What gauge kit depends on how big the amp is. Check the fuse(s) on the amp and add them together. Anything more than about 50 amps is going to require 4 gauge wire. Under that, you can do 8 gauge. And a side post battery terminal to connect this to your GM battery. You'll also need a line output converter if you're using the factory stereo still. If not, you're good to go.