If ultimate horsepower is your goal, then AVO recommends the specially designed TIG welded CNC mandrel bent exhaust extractors. It has an equal length design for correct exhaust pulse tuning at high RPM for improved mid to top-end performance. They look so good that you are going to want to keep them on your coffee table and not under the engine of your car where they could get dirty! AVO Turboworld recommends that the extractors be wrapped with Thermotec or similar extractor heat wrap to retain heat and improve turbo response time. These headers work best as a part of a substantial performance upgrade package, and may not give any improvement on an essentially stock motor. Has 3 bolt flange up-pipe and dual slip joint flex in extractor. Comes with 3 bolt flange gasket. For USDM 2.5-liter Legacy GT & 2.0L Single Scroll Turbochargers.