Cobb Subaru SS 3" Downpipe
The COBB Tuning downpipe begins with the CAD designed bellmouth that directs the air coming out of the turbo. The design permits the air to flow with very little turbulence to the single high flow catalytic converter. This metal substrate cat is highly efficient, allowing the exhaust to flow much easier than the factory unit ever would. 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.
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 shape of the outlet flange smoothly blends the turbine outlet and wastegate gases. The outlet flange is configured with an O2 sensor bung to accommodate the stock O2 sensor. A custom spun metal substrate high flow catalytic converter comes next. This one piece 400 grade stainless steel cat has a much higher flow rate and longer lifespan compared to ceramic or "brick" style cats. It also reaches operating temperature faster than other style cats for cleaner cold-start emissions. A second O2 sensor bung is located immediately after the cat to be used by the second OEM O2 sensor. All tubing used in the fabrication of this downpipe is 304 stainless steel for increased corrosion resistance. The end piping tapers down to a flange that uses the stock donut gasket and factory spring bolts to aid in flex, longevity and proper fitment. This provides an improved seal compared to other methods, as well as reduced noise. An additional benefit is that it makes the COBB 3" Downpipe compatible with any cat-back exhaust that mates to the factory cat section.
The COBB Tuning turbo downpipe is one of the premier modifications most owners look to upgrade on their vehicle. By opening the diameter of exhaust flow coming out of the turbo, the downpipe unleash power where the stock restrictive unit lacks.
- CAD Designed Cast Turbo Outlet for Maximum Flow
- 304 Stainless Steel for Corrosion Resistance
- Custom Spun Metal Substrate High Flow Cat
- Two O2 Bungs for Factory & Aftermarket Sensors
- Tapered Piping Utilizes Stock Donut Gasket for Optimal Sealing & Long Life
COBB Installation Guides & Manuals
COBB Subaru Downpipe 524203 Installation Instructions
This product is compatible with the following vehicles
| Vehicle Make | Vehicle Model | Vehicle Variant | From | To | Engine | Notes |
| Subaru | Impreza | STi | 2011 | 2014 | 2.5L - AWD Petrol |
COBB Hard Parts
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COBB Tuning is an automotive engineering company dedicated to developing solutions that improve vehicle performance and the driving experience. COBB Tuning approaches design by taking the entire vehicle-platform into account as a complete system. COBB's ultra-high-quality products and services are professionally engineered, thoroughly tested and backed by industry leading customer service to ensure that they meet our objectives and exceed customer expectations. Famous for their Accessports, COBB Tuning has expanded its product offerings to BMW, Ford, Mazda, Porsche , Mitsubishi, Nissan and Volkswagen specializing in engine management electronics, intake tract components, turbocharged exhaust systems, turbo kits, drivetrain components and suspension components.
COBB are a one-stop firm with an enviable set of qualified skills and the exceptional ability to design, engineer, manufacture, test and service our own products under one roof. Whether it’s our state-of-the-art Accessport ECU programmer, our exceptional bolt-on performance products, COBB Tuning has the experience, skill and attitude to meet your specific needs.
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