i have a supercharger that i will be putting on and i remember you talking to..... i forget but you said that the header would work well with the supercharger?? i was wondering if anyone else has a had a good outcome with it.
Since you're supercharged, you may want to look into a header for the supercharged Cobalt SS. They have larger diameter runners and a few of the J-body guys saw nice gains using it even without a supercharger.
The DC Sports header is 4-2-1 and pairs 1+4 and 2+3 cylinders for proper scavenging. As far as quality, I don't think you can get a better quality header than that. Everything they make is roboticly tig welded and looks as close to perfect as you can get.