The outlet flange is configured with an O2 sensor bung to accommodate the stock O2 sensor. The shape of the outlet flange smoothly blends the turbine outlet and wastegate gases. The engineering that went into the COBB 3" Downpipe started with the CAD designed investment-cast turbine outlet, made of 304 stainless steel for enduring corrosion resistance and reduced heat transfer to the engine bay. The COBB downpipe, combined with our Accessport engine management, is one of the most easy installations for any enthusiast looking to unlock the true potential of their WRX. This metal substrate cat is highly efficient, allowing the exhaust to flow much easier than the factory unit ever would. The design permits the air to flow with very little turbulence to the single high flow catalytic converter. The COBB Tuning downpipe begins with the CAD designed bellmouth that directs the air coming out of the turbo. A downpipe combined with the performance tuning found in the Accessport is the first step to any enthusiast looking to unlock the potential of their engine, while still maintaining a stock look around their vehicle. The COBB Tuning downpipe is available in a "Street" version that comes with a single high flow catalytic converter.
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