Yes you need tuning for the car and injectors aswell... Just find a place that has HPTuners, you dont have to own the program itself to just get a tune. If you guys already been searching you guys would of get the idea of what the "KIT" was sold with. Most the time when ppl selling M62 kit comes with the 36lbs injectors from a cobalt ss which is direct fit to our rail.
Things that are little different for our car, would be:
Need a T/B adapter unless its already included(if the kit came from a previous cavy they should have it already).
The radiator hose from the cobalt SS wont clear with our radiator. I ended up cutting my stock one and the SS one, and use an adapter. so basicly be creative, very simple..they sell adapters for hoses in autozone and advance auto.
For the Air to water Intercooler, I went with a cobra SVT one.(this is recommended to minimize some of the heatsoak, but is not needed to run the car just fine.) Other option is ZZP heat exchanger, but check measurements.
http://www.zzperformance.com/cobalt_...1097&catid=188