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Cobb Tuning Products 524220: Turbo Downpipe 304 Stainless Steel Natural Catted 3.0 in. Subaru Automatic Each – COBB Tuning Subaru catted downpipes begin with a CAD-designed investment-cast turbine outlet that directs the exhaust and opens the diameter of the exhaust tubing coming out of the turbocharger unleashing power restrictive stock units choke off. The shape of the outlet flange smoothly blends the turbo and wastegate gases and is configured with a bung to accommodate the first O2 sensor. This design permits the exhaust to flow with very little turbulence to the single highly-efficient high-flow catalytic converter. This one-piece 400-grade stainless steel cat has a much greater flow rate and a longer lifespan than ceramic or brick-style cats. It also reaches operating temperature faster for cleaner cold-start emissions. A second O2 sensor bung is located immediately after the cat. The end piping tapers down to a flange that uses the OE donut gasket and factory spring bolts to aid in flexibility longevity and proper fitment. This provides an improved seal compared to other methods as well as reduced noise. Additional features of COBB Tuning Subaru catted downpipes: . One of the best modifications to upgrade horsepower and torque. Use with Accessport engine management to unlock the true potential of your Subaru. CAD-designed bellmouth cast turbo outlet for maximum flow. 304 stainless steel construction for enduring corrosion resistance and reduced heat transfer to the engine bay. Custom-spun metal substrate high-flow catalytic converter. Two O2 bungs fit factory and aftermarket sensors. Compatible with any cat-back exhaust that mates to the OE cat section Cobb Tuning Products 524220 fits these applications: 2005-2009 SUBARU LEGACY 2005-2009 SUBARU OUTBACK