big 16g is a direct bolt on
intake/filter would be a good start
hard IC piping would be a great thing if your gonna install a 16g
you only need 1 header
2.25 is pretty much stock. most people go with 2.5 or 3 inch piping
if your gonna put on a 16g, a fuel pump would be good to get also

dont forget about gauges too. you need to know whats going on with all that stuff