I have 2007 LT 2.2 I don't think I have secondary air.
I've added a pic that I think confirms this.




So I'm not limited on what CAI or Header I can use?
What are some good choices in CAIs and header?
I am leaning towards the GMPP CAI but have no idea on what header & down pipe combo.
Is a header really worth it HP & Torque wise and at what point in these mods would you need a tune.

I already have Magnaflow exhaust.

Thanks for any help in advance

 

I hear the GMPP intake adds a whopping 2hp.
For the money, I would get an AEM or Injen.

As for a header, I prefer a 4:2:1 compared to a 4:1, but they are like $750+.
You get what you pay for, and e-bay offers lots of leaky headers for cheap.
Pacemaker sells theirs for cheap, and there is many DC sports knockoffs.
Just make sure the header is inspected before you start taking everything apart.