Subaru SS 3" Downpipe - Automatic Transmission

$ 650.00

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Product Code: 524212

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The COBB Tuning downpipe is available in a "Street" version that comes with a single high flow catalytic converter. 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 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. All tubing used in the fabrication of this downpipe is 304 stainless steel for increased corrosion resistance. The end flange 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.


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.

Subaru SS 3" Downpipe - Automatic Transmission
  • 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
  • Utilizes Stock Donut Gasket for Optimal Sealing & Long Life

Customer Photos

Subaru SS 3" Downpipe - Automatic Transmission is rated 5.0 out of 5 by 2.
Rated 5 out of 5 by from perfect fit, great look, more power, more MGP I had my local hot rod subie shop install. It was fast and cheap. Looks like everything lined up perfectly. I have aftermarket mufflers and noticed a slight increase in exhaust sound. A little turbo sound in the car with the windows down. BIG increase in power. Much faster spool up. I don't get into the gas pedal too hard as a general rule and am pretty sure I'm seeing about 10% better MPG. I'm sure if I drove it hard I would see a decrease. I bought the Cobb turbo heat shield along with the down pipe and my shop told me it wasn't necessary. They said absolutely no difference in performance. They did not charge me extra to remove, trim and reinstall the stock heat shield. Cobb was easy to work with when I returned their turbo heat shield.
Date published: 2014-10-15
Rated 5 out of 5 by from More HP than expected Install was easy. Make sure you get new gaskets and spring bolts as the downpipe does not include these items. Lined up perfect. Installed with accessport stage 2 93 octane. Instantly noticed low end power increase. Put auto trans in sport mode and you will get thrown back in the seat. Definitely the easiest horsepower out there.
Date published: 2015-12-26
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