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COBB GESI Catted 3 Inch Bellmouth Downpipe 2002-2007 WRX / 2004-2007 STI / 2004-2008 FXT

SKU 512210
Original price $995.00 - Original price $995.00
Original price
$995.00 - $995.00
Current price $995.00

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.

This downpipe requires tuning changes. COBB offers OTS Map support for some vehicles, No OTS Maps available for some models.


The COBB Tuning GESi Catted 3" 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 unleashes power where the stock restrictive unit lacks.


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

Customer Reviews

Based on 1 review

This part fits great and has the extra O2 bung for an a/f meter and makes tuning easier. Definitely changes the exhaust note from the car.


Thank you for leaving a 5 Star Review! The Subimods Team is happy to hear that the COBB GESI Catted 3 Inch Bellmouth Downpipe has met your expectations in terms of fit and functionality. We are also happy to know that it has made tuning easier for you with the extra O2 bung. Enjoy the new exhaust note and performance from your WRX!


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