First, i know their is no "cure" for p0300 but would a tune help this situation out??? (getting a wideband in a week or so) -car has never been to mitsu for the "cure flash"

Second, i need to know what the best bang for the buck is on intercooler pipeing and intakes.
I found injen full pipeing and intake for like 350$
I heard of so many good kits, but i just dont know which one to get!
Help plz
Thanks!!