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AVO Unequal Length Exhaust Header STi 2005-2007
If ultimate horsepower is your goal, then SPO recommends this specially designed TIG welded CNC mandrel bent exhaust manifold. It has an 4 into 1 design for correct exhaust pulse tuning at high RPM for improved mid to top-end performance while keeping that legendary boxer sound. 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.
This will fit STi 2005-2007