COBB Stainless Steel 3" Bellmouth Downpipe | Multiple Subaru Fitments (524210)

Cobb Tuning
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Subaru 3" GESI Catted Stainless Steel Bellmouth Downpipe by COBB Tuning

The COBB Tuning GESi Catted 3" Downpipe begins with a CAD designed cast bellmouth that smoothly blends air exiting the turbocharger's turbine housing. Minimizing turbulence when exhaust gasses from the wastegate join into those flowing through the turbine helps to prevent excessive back-pressure. The cast housing is capped off with a COBB logo and auxiliary O2 bung for those wanting to install a wideband sensor early in the exhaust path.

A welded bracket utilizes the factory hard mount near the transmission reducing stress on the turbocharger mounting bolts and studs.

Corrosion resistant and mandrel bent 3" 304 Stainless Steel tubing carries exhaust gasses down stream into a COBB-exclusive GESi 300 cell high flow catalytic converter. A second O2 bung is located directly after the catalytic converter and is to be used by the OEM Rear O2 sensor.

A CAD designed, cast 304 stainless steel, flange finishes off the tail section of the downpipe. The reinforced cast flange is less susceptible to warp during assembly and for those of you installing with the strength of Hulk. A stainless adapter flange and included MLS gasket allows direct fit with the factory exhaust or COBB Cat-Back Exhaust utilizing the OEM donut gasket. Included COBB proprietary shoulder nuts allow installation of the factory spring bolts without fuss.


  • CAD Designed Cast Turbo Outlet for Maximum Flow
  • 304 Stainless Steel for Corrosion Resistance
  • High Flow GESi Catalytic Converter
  • Two O2 Bungs for Factory & Aftermarket Sensors
  • Included Adapter Utilizes Stock Donut Gasket for Optimal Sealing & Long Life


  • 2008-2014 Subaru WRX
  • 2008-2014 Subaru WRX STI
  • 2009-2010 Subaru Impreza 2.5 GT
  • 2005-2009 Subaru Legacy GT (Manual Transmission Only)
  • 2009-2013 Subaru Forester XT
  • 2005-2009 Subaru Outback XT (Manual Transmission Only)

What's in the box?

  • 1 - 3" SS Bell Mouth Downpipe
  • Necessary Hardware for Installation



  • 1 Year Manufacturers Warranty

Customer Reviews

Based on 15 reviews
Kenneth Durci
Bellmouth is the way to go

Ordered this up because my wastegate kept hitting the divorced downpipe I had. Phenomenal customer service, and quick shipping.

Daniel R.
Exceptional quality

10/10 worth it! Install was a breeze and quality is top notch!

Zac H.
Great Product

Honestly was surprised with how amazing this downpipe sounds and performs. Build quality is fantastic. Great low rumble when idling or putzing around town, but really opens up when you hit the throttle.

Cobb downpipe

I'm extremely happy with this downpipe. The extra bung for an o2 sensor is super convenient; made putting the AEM A/f gauge sensor super easy. Couldn't be happier with the perfect fitment as well as the finish on it. Can't thank MAPerformance enough for the amazing customer support on helping me choose the downpipe that'd work best for me.

Cobb Downpipe

I'm extremely happy with this downpipe. It's really well made and the fitment perfect. The extra bung for an o2 sensor is convenient; made putting the A/f gauge sensor super easy.