ok 1st thing id do is look at the exhaust i.e manifold, free flow cat or de cat then a good cat backexhaust.
look at either a panel filter in the box or some kind of forced induction kit, maybe a remap to bring everythin into tune.
start with the basic ABC mods.
then if you want more after that then do some research into what you need.
inlet manifold i wouldnt worry about too much at the moment as they will flow pretty well stock