Extreme Turbo Systems has the best manifold solution for your 08+ Subaru STI. We prioritized flow and craftsmanship with this ETS manifold. With a tubular manifold, weld quality is of the highest priority. These are hand ported from the head flange to the end of the runner. With the flow improvement supplied by this manifold, your turbo will spool faster and harder, and exhaust temp will remain lower.