im not wise into the whole intake system of vehicles, what would adding a cold air intake do to a 4.3 vortec? if i got the intake system put in, would it be best to follow up with some headers?.

The best followup is cat back exhaust. A y-pipe would be the next, and finally headers. Y-pipe/headers at the same time is cool too.

Thing is headers on a 4.3 are hella tought to install and people like to do it last, seeing as you dont gain as much from the other two. Stock headers are good till about 300HP.

well for this information i thank you