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  Subaru SS 3" Downpipe
Subaru SS 3" Downpipe

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Improve exhaust flow, faster turbo response time and power gains

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 COBB downpipe unleashes more power potential over the stock restrictive unit.

Price: $595.00

Availability: Usually Ships in 24 Hours
Product Code: 524202


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 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 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. An additional benefit is that it makes the COBB 3" Downpipe compatible with any cat-back exhaust that mates to the factory cat section.


2008 Subaru WRX Hatch
+13%HP / +14%TQ

(with appropriate ECU tuning)

2009-2010 Subaru WRX Hatch
+19%HP / +28%TQ

(with appropriate ECU tuning)


  • CAD designed cast turbo outlet for maximum flow
  • Minimal bends for less restriction
  • 304 stainless steel throughout for corrosion resistance
  • Custom spun metal substrate high flow cat
  • Two O2 bungs for factory sensors
  • Stock donut gasket for optimal sealing and long life

2015 STI Customers – For the time being, this downpipe requires custom tuning

Make Model Years
Subaru WRX 2008-2014
Subaru STI (Sedan) 2011-2015
Subaru STI (Wagon) 2008-2014
Subaru Legacy GT (MT Only) 2005-2009
Subaru Legacy GT Spec B 2006-2009
Subaru Outback XT (MT Only) 2005-2009
Subaru Forester XT 2009-2013
Subaru 2.5GT 2009-2010