GM Performance Parts Stage Three kit, plus the required components from the Stage Two kit. Stage Three is an upgrade to Stage Two.

This is GM's highest level performance kit for the Chevy Cobalt SS Supercharged and Saturn ION Redline cars. It is an off-highway (not street legal and not emissions certified) kit.

I hope this post will answer most of your questions -- both about how to make the kit work for you and about why we did what we did with the kit.