LT's + Vortech = lean?
If you already have the kit installed, adding headers will lower your boost by about 2PSI, and you'll pick up a few horses. You'll need to pulley back up to make real power, though, but don't do that without a retune.
That said, I don't trust the Superchips tune regardless. I lost 50 horses with superchips. I always recommend a custom tune for supercharged LS1's, the extra $300 or so is worth it in the long run.



