COBB Tuning Catted Downpipe for Subaru Forester XT, Impreza WRX & STi

COBB Tuning Catted Downpipe for Subaru Forester XT, Impreza WRX & STi

The COBB Tuning GESi Catted 3″ Downpipe initiates with a CAD-designed cast bellmouth, ensuring a seamless blend of air exiting the turbocharger’s turbine housing to minimize turbulence, thus preventing excessive back-pressure when exhaust gases from the wastegate join those flowing through the turbine. The cast housing is adorned with a COBB logo and auxiliary O2 bung for those interested in installing a wideband sensor early in the exhaust path. A welded bracket utilizes the factory hard mount near the transmission to reduce stress on the turbocharger mounting bolts and studs. Corrosion-resistant and mandrel-bent 3″ 304 stainless steel tubing guides exhaust gases downstream into a COBB-exclusive GESi 300-cell high-flow catalytic converter, with a second O2 bung located directly after the catalytic converter for use by the OEM Rear O2 sensor. A CAD-designed, cast 304 stainless steel flange completes the tail section of the downpipe, reinforced to minimize warping during assembly. The inclusion of a stainless adapter flange and MLS gasket allows for a direct fit with the factory exhaust or COBB cat-back exhaust using the OEM donut gasket, with COBB proprietary shoulder nuts included to facilitate installation of the factory spring bolts.

Why COBB Tuning?

• The COBB Tuning GESi Catted 3″ downpipe stands as a top priority upgrade for many vehicle owners. By increasing the diameter of exhaust flow exiting the turbo, the downpipe unlocks power where the stock restrictive unit falls short.

Features

• 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

Applications

• Subaru Forester XT: SG (2004-2008)
• Subaru Impreza WRX: GH, GE (2008-2014)
• Subaru Impreza WRX STi: GR, GV (2008-2014)

Notes

• Tuning adjustments are necessary for this downpipe to function optimally

Emissions

• This part is in the process of external testing with the EO process ongoing
• While they believe that these parts adhere to EPA’s Anti-Tampering Policy, the testing / CARB EO submission process has not been finalized

About COBB Tuning

With over two decades of Research and Development, COBB Tuning has developed upgrade paths that equip vehicles to transform from standard factory models into powerful, drivable machines that enhance daily driving experiences. Each upgrade path is tailored to optimize the power of the Accessport, hard parts, and their off-the-shelf maps. Originating with a focus on Subaru, COBB Tuning has expanded its range to include products for BMW, Ford, Mazda, Porsche, Mitsubishi, Nissan, Audi, Volkswagen, and Honda. Their area of expertise covers engine management electronics, intake tract components, exhaust systems for turbocharged engines, turbo kits, drivetrain components, and suspension parts.