I am not up on the V6 mods....but cat-back and intake are the first steps.
Also, a lid is an intake isn't it? Why would you get a lid and the Fast Toys piece?? Do they work together? Not sure about that.
Magnaflow for exhaust.
Also, check out
www.byunspeed.com for deals. His prices include shipping. Great customer service, and he gets things out FAST.