ATI now has their 8 rib LS1 superchargers ready to go so we are moving them out! This is being offered as an upgrade to their standard 6 rib system so it can be ordered either way. The only thing that they aren't including with the kit is the harmonic balancer but we are taking care of that to make this a complete kit for you! You'll still need injectors (42#), a fuel pump and programming. Those options are also available.