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Cobb Tuning


COBB GESI Catted 3" Resonated J-Pipe - Subaru WRX 2015-2020 (6MT)

The COBB Tuning GESi Catted 3" J-Pipe begins with a CAD designed 4" cast bellmouth that smoothly blends air exiting the turbocharger's turbine housing straight into the GESi High Flow Catalytic Converter. Minimizing turbulence when exhaust gasses from the wastegate join into those flowing through the turbine helps to prevent excessive back-pressure.

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 J-Pipe. 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.


The COBB Tuning GESi Catted 3" J-Pipe is one of the premier modifications WRX owners look to upgrade on their vehicle. By opening the diameter of exhaust flow coming out of the turbo, the downpipe unleashes power where the stock restrictive unit lacks.


  • High Flow GESi Catalytic Converter
  • 3" 304 Stainless Steel Construction with Resonator
  • CAD Designed 4" Cast Turbo Outlet for Maximum Flow
  • Cat-Back Connection - 3" Flat Flange or Donut Adapter
  • Custom Tuning Required

    *Pictures used for marketing purposes only, actual products may vary

    • 2015-2020 Subaru WRX (6 Speed Manual Trans)


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