Originally Posted by chitownej
i dont know if this is a stupid question, but whats the spitter?
It's the metal part between the actual hood scoop and the intercooler. What it does is direct the flow from the outside over the intercooler. Without it, your intercooler is just floating in the wind (aka not useful).
When you change from a WRX intercooler to an STi unit, you need the change the splitter and shroud because the old one won't fit.